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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/208816">208816</a></dd>
<dt>Author</dt> <dd>simon.fraser@apple.com</dd>
<dt>Date</dt> <dd>2016-11-16 15:05:00 -0800 (Wed, 16 Nov 2016)</dd>
</dl>

<h3>Log Message</h3>
<pre>UIScriptController: script with no async tasks fails if an earlier script registered a callback
https://bugs.webkit.org/show_bug.cgi?id=164762

Reviewed by Wenson Hsieh.

Tools:

Make TestRunner::callUIScriptCallback() async in DumpRenderTree to match WebKitTestRunner behavior.
This fixes ui-side-script-with-callback.html in WK1, which failed because the second runUIScript()
would occur inside the completion callback from the first. This no longer happens.

* DumpRenderTree/TestRunner.cpp:
(TestRunner::callUIScriptCallback):
* TestRunnerShared/UIScriptContext/UIScriptContext.cpp:
(UIScriptContext::tryToCompleteUIScriptForCurrentParentCallback):

LayoutTests:

Move the tests that use runUIScript into their own directory for easier TestExpectations management,
and fix TestExpectations to match.

* TestExpectations:
* fast/harness/uiscriptcontroller/concurrent-ui-side-scripts-expected.txt: Renamed from LayoutTests/fast/harness/concurrent-ui-side-scripts-expected.txt.
* fast/harness/uiscriptcontroller/concurrent-ui-side-scripts.html: Renamed from LayoutTests/fast/harness/concurrent-ui-side-scripts.html.
* fast/harness/uiscriptcontroller/ui-side-script-unregister-callback-expected.txt: Copied from LayoutTests/fast/harness/ui-side-script-unregister-callback-expected.txt.
* fast/harness/uiscriptcontroller/ui-side-script-unregister-callback.html: Copied from LayoutTests/fast/harness/ui-side-script-unregister-callback.html.
* fast/harness/uiscriptcontroller/ui-side-script-with-callback-expected.txt: Renamed from LayoutTests/fast/harness/ui-side-script-unregister-callback-expected.txt.
* fast/harness/uiscriptcontroller/ui-side-script-with-callback.html: Renamed from LayoutTests/fast/harness/ui-side-script-unregister-callback.html.
* fast/harness/uiscriptcontroller/ui-side-scripts-expected.txt: Renamed from LayoutTests/fast/harness/ui-side-scripts-expected.txt.
* fast/harness/uiscriptcontroller/ui-side-scripts.html: Renamed from LayoutTests/fast/harness/ui-side-scripts.html.
* platform/mac/TestExpectations:</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsChangeLog">trunk/LayoutTests/ChangeLog</a></li>
<li><a href="#trunkLayoutTestsTestExpectations">trunk/LayoutTests/TestExpectations</a></li>
<li><a href="#trunkLayoutTestsplatformmacTestExpectations">trunk/LayoutTests/platform/mac/TestExpectations</a></li>
<li><a href="#trunkToolsChangeLog">trunk/Tools/ChangeLog</a></li>
<li><a href="#trunkToolsDumpRenderTreeTestRunnercpp">trunk/Tools/DumpRenderTree/TestRunner.cpp</a></li>
<li><a href="#trunkToolsTestRunnerSharedUIScriptContextUIScriptContextcpp">trunk/Tools/TestRunnerShared/UIScriptContext/UIScriptContext.cpp</a></li>
</ul>

<h3>Added Paths</h3>
<ul>
<li>trunk/LayoutTests/fast/harness/uiscriptcontroller/</li>
<li><a href="#trunkLayoutTestsfastharnessuiscriptcontrollerconcurrentuisidescriptsexpectedtxt">trunk/LayoutTests/fast/harness/uiscriptcontroller/concurrent-ui-side-scripts-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfastharnessuiscriptcontrollerconcurrentuisidescriptshtml">trunk/LayoutTests/fast/harness/uiscriptcontroller/concurrent-ui-side-scripts.html</a></li>
<li><a href="#trunkLayoutTestsfastharnessuiscriptcontrolleruisidescriptunregistercallbackexpectedtxt">trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-script-unregister-callback-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfastharnessuiscriptcontrolleruisidescriptunregistercallbackhtml">trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-script-unregister-callback.html</a></li>
<li><a href="#trunkLayoutTestsfastharnessuiscriptcontrolleruisidescriptwithcallbackexpectedtxt">trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-script-with-callback-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfastharnessuiscriptcontrolleruisidescriptwithcallbackhtml">trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-script-with-callback.html</a></li>
<li><a href="#trunkLayoutTestsfastharnessuiscriptcontrolleruisidescriptsexpectedtxt">trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-scripts-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfastharnessuiscriptcontrolleruisidescriptshtml">trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-scripts.html</a></li>
</ul>

<h3>Removed Paths</h3>
<ul>
<li><a href="#trunkLayoutTestsfastharnessconcurrentuisidescriptsexpectedtxt">trunk/LayoutTests/fast/harness/concurrent-ui-side-scripts-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfastharnessconcurrentuisidescriptshtml">trunk/LayoutTests/fast/harness/concurrent-ui-side-scripts.html</a></li>
<li><a href="#trunkLayoutTestsfastharnessuisidescriptunregistercallbackexpectedtxt">trunk/LayoutTests/fast/harness/ui-side-script-unregister-callback-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfastharnessuisidescriptunregistercallbackhtml">trunk/LayoutTests/fast/harness/ui-side-script-unregister-callback.html</a></li>
<li><a href="#trunkLayoutTestsfastharnessuisidescriptsexpectedtxt">trunk/LayoutTests/fast/harness/ui-side-scripts-expected.txt</a></li>
<li><a href="#trunkLayoutTestsfastharnessuisidescriptshtml">trunk/LayoutTests/fast/harness/ui-side-scripts.html</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkLayoutTestsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/ChangeLog (208815 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/ChangeLog        2016-11-16 22:53:48 UTC (rev 208815)
+++ trunk/LayoutTests/ChangeLog        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -1,3 +1,24 @@
</span><ins>+2016-11-16  Simon Fraser  &lt;simon.fraser@apple.com&gt;
+
+        UIScriptController: script with no async tasks fails if an earlier script registered a callback
+        https://bugs.webkit.org/show_bug.cgi?id=164762
+
+        Reviewed by Wenson Hsieh.
+        
+        Move the tests that use runUIScript into their own directory for easier TestExpectations management,
+        and fix TestExpectations to match.
+
+        * TestExpectations:
+        * fast/harness/uiscriptcontroller/concurrent-ui-side-scripts-expected.txt: Renamed from LayoutTests/fast/harness/concurrent-ui-side-scripts-expected.txt.
+        * fast/harness/uiscriptcontroller/concurrent-ui-side-scripts.html: Renamed from LayoutTests/fast/harness/concurrent-ui-side-scripts.html.
+        * fast/harness/uiscriptcontroller/ui-side-script-unregister-callback-expected.txt: Copied from LayoutTests/fast/harness/ui-side-script-unregister-callback-expected.txt.
+        * fast/harness/uiscriptcontroller/ui-side-script-unregister-callback.html: Copied from LayoutTests/fast/harness/ui-side-script-unregister-callback.html.
+        * fast/harness/uiscriptcontroller/ui-side-script-with-callback-expected.txt: Renamed from LayoutTests/fast/harness/ui-side-script-unregister-callback-expected.txt.
+        * fast/harness/uiscriptcontroller/ui-side-script-with-callback.html: Renamed from LayoutTests/fast/harness/ui-side-script-unregister-callback.html.
+        * fast/harness/uiscriptcontroller/ui-side-scripts-expected.txt: Renamed from LayoutTests/fast/harness/ui-side-scripts-expected.txt.
+        * fast/harness/uiscriptcontroller/ui-side-scripts.html: Renamed from LayoutTests/fast/harness/ui-side-scripts.html.
+        * platform/mac/TestExpectations:
+
</ins><span class="cx"> 2016-11-16  Alex Christensen  &lt;achristensen@webkit.org&gt;
</span><span class="cx"> 
</span><span class="cx">         REGRESSION (r207162): [debug] loader/stateobjects LayoutTests timing out
</span></span></pre></div>
<a id="trunkLayoutTestsTestExpectations"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/TestExpectations (208815 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/TestExpectations        2016-11-16 22:53:48 UTC (rev 208815)
+++ trunk/LayoutTests/TestExpectations        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -56,8 +56,7 @@
</span><span class="cx"> http/tests/misc/will-send-request-with-client-provided-http-body.html [ Skip ]
</span><span class="cx"> 
</span><span class="cx"> # Only Mac and iOS have an implementation of UIScriptController::doAsyncTask().
</span><del>-fast/harness/ui-side-scripts.html [ Skip ]
-fast/harness/concurrent-ui-side-scripts.html [ Skip ]
</del><ins>+fast/harness/uiscriptcontroller [ Skip ]
</ins><span class="cx"> 
</span><span class="cx"> # This test only makes sense on Mac
</span><span class="cx"> fast/attachment/attachment-subtitle-resize.html
</span></span></pre></div>
<a id="trunkLayoutTestsfastharnessconcurrentuisidescriptsexpectedtxt"></a>
<div class="delfile"><h4>Deleted: trunk/LayoutTests/fast/harness/concurrent-ui-side-scripts-expected.txt (208815 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/harness/concurrent-ui-side-scripts-expected.txt        2016-11-16 22:53:48 UTC (rev 208815)
+++ trunk/LayoutTests/fast/harness/concurrent-ui-side-scripts-expected.txt        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -1,9 +0,0 @@
</span><del>-Script 2:
-Running UI-side script 2
-Completed async task 2.1. Script done.
-Script 1:
-Running UI-side script 1
-Completed async task 1.1.
-Completed async task 1.2.
-Completed async task 1.3. Script done.
-.
</del></span></pre></div>
<a id="trunkLayoutTestsfastharnessconcurrentuisidescriptshtml"></a>
<div class="delfile"><h4>Deleted: trunk/LayoutTests/fast/harness/concurrent-ui-side-scripts.html (208815 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/harness/concurrent-ui-side-scripts.html        2016-11-16 22:53:48 UTC (rev 208815)
+++ trunk/LayoutTests/fast/harness/concurrent-ui-side-scripts.html        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -1,80 +0,0 @@
</span><del>-&lt;!DOCTYPE html&gt;
-
-&lt;html&gt;
-&lt;head&gt;
-    &lt;script id=&quot;ui-script1&quot; type=&quot;text/plain&quot;&gt;
-        (function() {
-            var completions = 'Running UI-side script 1\n';
-            
-            uiController.doAsyncTask(function() {
-                completions += 'Completed async task 1.1.\n';
-
-                uiController.doAsyncTask(function() {
-                    completions += 'Completed async task 1.2.\n';
-
-                    uiController.doAsyncTask(function() {
-                        completions += 'Completed async task 1.3. Script done.\n';
-
-                        uiController.uiScriptComplete(completions);
-                    });
-                });
-            });
-        })();
-    &lt;/script&gt;
-
-    &lt;script id=&quot;ui-script2&quot; type=&quot;text/plain&quot;&gt;
-        (function() {
-            var completions2 = 'Running UI-side script 2\n';
-
-            uiController.doAsyncTask(function() {
-                completions2 += 'Completed async task 2.1. Script done.\n';
-
-                uiController.uiScriptComplete(completions2);
-            });
-        })();
-    &lt;/script&gt;
-
-    &lt;script&gt;
-        if (window.testRunner) {
-            testRunner.dumpAsText();
-            testRunner.waitUntilDone();
-        }
-
-        var outstandingScripts = 2;
-        function runTest()
-        {
-            if (testRunner.runUIScript) {
-                var uiScript = document.getElementById('ui-script1').text;
-                testRunner.runUIScript(uiScript, function(result) {
-                    document.getElementById('results').textContent += 'Script 1:\n' + result;
-                    --outstandingScripts;
-                    checkIfScriptsComplete();
-                });
-
-                var uiScript2 = document.getElementById('ui-script2').text;
-                testRunner.runUIScript(uiScript2, function(result) {
-                    document.getElementById('results').textContent += 'Script 2:\n' + result;
-                    --outstandingScripts;
-                    checkIfScriptsComplete();
-                });
-            }
-        }
-        
-        function checkIfScriptsComplete(remaining)
-        {
-            if (outstandingScripts)
-                return;
-
-            testRunner.notifyDone();
-        }
-
-        window.addEventListener('load', runTest, false);
-    &lt;/script&gt;
-&lt;/head&gt;
-&lt;body&gt;
-
-&lt;pre id=&quot;results&quot;&gt;&lt;/pre&gt;
-
-&lt;/body&gt;
-&lt;/html&gt;
-.
</del><span class="cx">\ No newline at end of file
</span></span></pre></div>
<a id="trunkLayoutTestsfastharnessuisidescriptunregistercallbackexpectedtxt"></a>
<div class="delfile"><h4>Deleted: trunk/LayoutTests/fast/harness/ui-side-script-unregister-callback-expected.txt (208815 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/harness/ui-side-script-unregister-callback-expected.txt        2016-11-16 22:53:48 UTC (rev 208815)
+++ trunk/LayoutTests/fast/harness/ui-side-script-unregister-callback-expected.txt        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -1,11 +0,0 @@
</span><del>-Test that a second immediate UI script returns if an earlier script registered then unregistered a callback
-
-On success, you will see a series of &quot;PASS&quot; messages, followed by &quot;TEST COMPLETE&quot;.
-
-
-PASS scriptResult is &quot;async task complete&quot;
-PASS scriptResult is &quot;immediate script complete&quot;
-PASS successfullyParsed is true
-
-TEST COMPLETE
-
</del></span></pre></div>
<a id="trunkLayoutTestsfastharnessuisidescriptunregistercallbackhtml"></a>
<div class="delfile"><h4>Deleted: trunk/LayoutTests/fast/harness/ui-side-script-unregister-callback.html (208815 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/harness/ui-side-script-unregister-callback.html        2016-11-16 22:53:48 UTC (rev 208815)
+++ trunk/LayoutTests/fast/harness/ui-side-script-unregister-callback.html        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -1,63 +0,0 @@
</span><del>-&lt;!DOCTYPE html&gt;
-
-&lt;html&gt;
-&lt;head&gt;
-    &lt;script src=&quot;../../resources/js-test-pre.js&quot;&gt;&lt;/script&gt;
-    &lt;script&gt;
-        
-        var jsTestIsAsync = true;
-        
-        function getAsyncTaskScript()
-        {
-            return `(function() {
-                uiController.didEndScrollingCallback = function() { };
-                uiController.didEndScrollingCallback = undefined;
-
-                uiController.doAsyncTask(function() {
-                    uiController.uiScriptComplete('async task complete');
-                });
-            })();`;
-        }
-
-        function getImmediateScript()
-        {
-            return `(function() {
-                return 'immediate script complete';
-            })();`;
-        }
-    
-        var scriptResult;
-        function runTest()
-        {
-            description('Test that a second immediate UI script returns if an earlier script registered then unregistered a callback');
-
-            if (!window.testRunner) {
-                debug('This test requires testRunner');
-                return;
-            }
-
-            if (!testRunner.runUIScript) {
-                debug('This test requires runUIScript');
-                return;
-            }
-
-            testRunner.runUIScript(getAsyncTaskScript(), function(result) {
-                scriptResult = result;
-                shouldBeEqualToString('scriptResult', 'async task complete');
-
-                testRunner.runUIScript(getImmediateScript(), function(result) {
-                    scriptResult = result;
-                    shouldBeEqualToString('scriptResult', 'immediate script complete');
-                    finishJSTest();
-                });
-            });
-        }
-        window.addEventListener('load', runTest, false);
-    &lt;/script&gt;
-&lt;/head&gt;
-&lt;body&gt;
-
-&lt;pre id=&quot;results&quot;&gt;&lt;/pre&gt;
-&lt;script src=&quot;../../resources/js-test-post.js&quot;&gt;&lt;/script&gt;
-&lt;/body&gt;
-&lt;/html&gt;
</del></span></pre></div>
<a id="trunkLayoutTestsfastharnessuisidescriptsexpectedtxt"></a>
<div class="delfile"><h4>Deleted: trunk/LayoutTests/fast/harness/ui-side-scripts-expected.txt (208815 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/harness/ui-side-scripts-expected.txt        2016-11-16 22:53:48 UTC (rev 208815)
+++ trunk/LayoutTests/fast/harness/ui-side-scripts-expected.txt        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -1,10 +0,0 @@
</span><del>-Running the UI-side script
-Completed async task 1.1.
-Completed async task 2.1.
-Completed async task 1.2.
-Completed async task 2.1.
-Completed async task 2.2.1.
-Completed async task 1.3.
-Completed async task 2.3.
-Completed async task 2.2.2.
-.
</del></span></pre></div>
<a id="trunkLayoutTestsfastharnessuisidescriptshtml"></a>
<div class="delfile"><h4>Deleted: trunk/LayoutTests/fast/harness/ui-side-scripts.html (208815 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/harness/ui-side-scripts.html        2016-11-16 22:53:48 UTC (rev 208815)
+++ trunk/LayoutTests/fast/harness/ui-side-scripts.html        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -1,85 +0,0 @@
</span><del>-&lt;!DOCTYPE html&gt;
-
-&lt;html&gt;
-&lt;head&gt;
-    &lt;script id=&quot;ui-script&quot; type=&quot;text/plain&quot;&gt;
-        (function() {
-            var completions = 'Running the UI-side script\n';
-            var outstandingTaskCount = 3;
-            
-            uiController.doAsyncTask(function() {
-                completions += 'Completed async task 1.1.\n';
-
-                uiController.doAsyncTask(function() {
-                    completions += 'Completed async task 1.2.\n';
-
-                    uiController.doAsyncTask(function() {
-                        completions += 'Completed async task 1.3.\n';
-
-                        --outstandingTaskCount;
-                        checkIfTasksFinished();
-                    });
-                });
-            });
-
-            uiController.doAsyncTask(function() {
-                completions += 'Completed async task 2.1.\n';
-
-                uiController.doAsyncTask(function() {
-                    completions += 'Completed async task 2.1.\n';
-
-                    uiController.doAsyncTask(function() {
-                        completions += 'Completed async task 2.3.\n';
-
-                        --outstandingTaskCount;
-                        checkIfTasksFinished();
-                    });
-                });
-
-                uiController.doAsyncTask(function() {
-                    completions += 'Completed async task 2.2.1.\n';
-
-                    uiController.doAsyncTask(function() {
-                        completions += 'Completed async task 2.2.2.\n';
-
-                        --outstandingTaskCount;
-                        checkIfTasksFinished();
-                    });
-                });
-            });
-            
-            function checkIfTasksFinished()
-            {
-                if (!outstandingTaskCount)
-                    uiController.uiScriptComplete(completions);
-            }
-        })();
-    &lt;/script&gt;
-
-    &lt;script&gt;
-        if (window.testRunner) {
-            testRunner.dumpAsText();
-            testRunner.waitUntilDone();
-        }
-
-        function runTest()
-        {
-            if (testRunner.runUIScript) {
-                var uiScript = document.getElementById('ui-script').text;
-                testRunner.runUIScript(uiScript, function(result) {
-                    document.getElementById('result').textContent = result;
-                    testRunner.notifyDone();
-                });
-            }
-        }
-
-        window.addEventListener('load', runTest, false);
-    &lt;/script&gt;
-&lt;/head&gt;
-&lt;body&gt;
-
-&lt;pre id=&quot;result&quot;&gt;This test has to run in iOS WebKitTestRunner.&lt;/pre&gt;
-
-&lt;/body&gt;
-&lt;/html&gt;
-.
</del><span class="cx">\ No newline at end of file
</span></span></pre></div>
<a id="trunkLayoutTestsfastharnessuiscriptcontrollerconcurrentuisidescriptsexpectedtxtfromrev208815trunkLayoutTestsfastharnessconcurrentuisidescriptsexpectedtxt"></a>
<div class="copfile"><h4>Copied: trunk/LayoutTests/fast/harness/uiscriptcontroller/concurrent-ui-side-scripts-expected.txt (from rev 208815, trunk/LayoutTests/fast/harness/concurrent-ui-side-scripts-expected.txt) (0 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/harness/uiscriptcontroller/concurrent-ui-side-scripts-expected.txt                                (rev 0)
+++ trunk/LayoutTests/fast/harness/uiscriptcontroller/concurrent-ui-side-scripts-expected.txt        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -0,0 +1,9 @@
</span><ins>+Script 2:
+Running UI-side script 2
+Completed async task 2.1. Script done.
+Script 1:
+Running UI-side script 1
+Completed async task 1.1.
+Completed async task 1.2.
+Completed async task 1.3. Script done.
+.
</ins></span></pre></div>
<a id="trunkLayoutTestsfastharnessuiscriptcontrollerconcurrentuisidescriptshtmlfromrev208815trunkLayoutTestsfastharnessconcurrentuisidescriptshtml"></a>
<div class="copfile"><h4>Copied: trunk/LayoutTests/fast/harness/uiscriptcontroller/concurrent-ui-side-scripts.html (from rev 208815, trunk/LayoutTests/fast/harness/concurrent-ui-side-scripts.html) (0 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/harness/uiscriptcontroller/concurrent-ui-side-scripts.html                                (rev 0)
+++ trunk/LayoutTests/fast/harness/uiscriptcontroller/concurrent-ui-side-scripts.html        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -0,0 +1,80 @@
</span><ins>+&lt;!DOCTYPE html&gt;
+
+&lt;html&gt;
+&lt;head&gt;
+    &lt;script id=&quot;ui-script1&quot; type=&quot;text/plain&quot;&gt;
+        (function() {
+            var completions = 'Running UI-side script 1\n';
+            
+            uiController.doAsyncTask(function() {
+                completions += 'Completed async task 1.1.\n';
+
+                uiController.doAsyncTask(function() {
+                    completions += 'Completed async task 1.2.\n';
+
+                    uiController.doAsyncTask(function() {
+                        completions += 'Completed async task 1.3. Script done.\n';
+
+                        uiController.uiScriptComplete(completions);
+                    });
+                });
+            });
+        })();
+    &lt;/script&gt;
+
+    &lt;script id=&quot;ui-script2&quot; type=&quot;text/plain&quot;&gt;
+        (function() {
+            var completions2 = 'Running UI-side script 2\n';
+
+            uiController.doAsyncTask(function() {
+                completions2 += 'Completed async task 2.1. Script done.\n';
+
+                uiController.uiScriptComplete(completions2);
+            });
+        })();
+    &lt;/script&gt;
+
+    &lt;script&gt;
+        if (window.testRunner) {
+            testRunner.dumpAsText();
+            testRunner.waitUntilDone();
+        }
+
+        var outstandingScripts = 2;
+        function runTest()
+        {
+            if (testRunner.runUIScript) {
+                var uiScript = document.getElementById('ui-script1').text;
+                testRunner.runUIScript(uiScript, function(result) {
+                    document.getElementById('results').textContent += 'Script 1:\n' + result;
+                    --outstandingScripts;
+                    checkIfScriptsComplete();
+                });
+
+                var uiScript2 = document.getElementById('ui-script2').text;
+                testRunner.runUIScript(uiScript2, function(result) {
+                    document.getElementById('results').textContent += 'Script 2:\n' + result;
+                    --outstandingScripts;
+                    checkIfScriptsComplete();
+                });
+            }
+        }
+        
+        function checkIfScriptsComplete(remaining)
+        {
+            if (outstandingScripts)
+                return;
+
+            testRunner.notifyDone();
+        }
+
+        window.addEventListener('load', runTest, false);
+    &lt;/script&gt;
+&lt;/head&gt;
+&lt;body&gt;
+
+&lt;pre id=&quot;results&quot;&gt;&lt;/pre&gt;
+
+&lt;/body&gt;
+&lt;/html&gt;
+.
</ins><span class="cx">\ No newline at end of file
</span></span></pre></div>
<a id="trunkLayoutTestsfastharnessuiscriptcontrolleruisidescriptunregistercallbackexpectedtxtfromrev208815trunkLayoutTestsfastharnessuisidescriptunregistercallbackexpectedtxt"></a>
<div class="copfile"><h4>Copied: trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-script-unregister-callback-expected.txt (from rev 208815, trunk/LayoutTests/fast/harness/ui-side-script-unregister-callback-expected.txt) (0 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-script-unregister-callback-expected.txt                                (rev 0)
+++ trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-script-unregister-callback-expected.txt        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -0,0 +1,11 @@
</span><ins>+Test that a second immediate UI script returns if an earlier script registered then unregistered a callback
+
+On success, you will see a series of &quot;PASS&quot; messages, followed by &quot;TEST COMPLETE&quot;.
+
+
+PASS scriptResult is &quot;async task complete&quot;
+PASS scriptResult is &quot;immediate script complete&quot;
+PASS successfullyParsed is true
+
+TEST COMPLETE
+
</ins></span></pre></div>
<a id="trunkLayoutTestsfastharnessuiscriptcontrolleruisidescriptunregistercallbackhtmlfromrev208815trunkLayoutTestsfastharnessuisidescriptunregistercallbackhtml"></a>
<div class="copfile"><h4>Copied: trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-script-unregister-callback.html (from rev 208815, trunk/LayoutTests/fast/harness/ui-side-script-unregister-callback.html) (0 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-script-unregister-callback.html                                (rev 0)
+++ trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-script-unregister-callback.html        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -0,0 +1,63 @@
</span><ins>+&lt;!DOCTYPE html&gt;
+
+&lt;html&gt;
+&lt;head&gt;
+    &lt;script src=&quot;../../../resources/js-test-pre.js&quot;&gt;&lt;/script&gt;
+    &lt;script&gt;
+        
+        var jsTestIsAsync = true;
+        
+        function getAsyncTaskScript()
+        {
+            return `(function() {
+                uiController.didEndScrollingCallback = function() { };
+                uiController.didEndScrollingCallback = undefined;
+
+                uiController.doAsyncTask(function() {
+                    uiController.uiScriptComplete('async task complete');
+                });
+            })();`;
+        }
+
+        function getImmediateScript()
+        {
+            return `(function() {
+                return 'immediate script complete';
+            })();`;
+        }
+    
+        var scriptResult;
+        function runTest()
+        {
+            description('Test that a second immediate UI script returns if an earlier script registered then unregistered a callback');
+
+            if (!window.testRunner) {
+                debug('This test requires testRunner');
+                return;
+            }
+
+            if (!testRunner.runUIScript) {
+                debug('This test requires runUIScript');
+                return;
+            }
+
+            testRunner.runUIScript(getAsyncTaskScript(), function(result) {
+                scriptResult = result;
+                shouldBeEqualToString('scriptResult', 'async task complete');
+
+                testRunner.runUIScript(getImmediateScript(), function(result) {
+                    scriptResult = result;
+                    shouldBeEqualToString('scriptResult', 'immediate script complete');
+                    finishJSTest();
+                });
+            });
+        }
+        window.addEventListener('load', runTest, false);
+    &lt;/script&gt;
+&lt;/head&gt;
+&lt;body&gt;
+
+&lt;pre id=&quot;results&quot;&gt;&lt;/pre&gt;
+&lt;script src=&quot;../../../resources/js-test-post.js&quot;&gt;&lt;/script&gt;
+&lt;/body&gt;
+&lt;/html&gt;
</ins></span></pre></div>
<a id="trunkLayoutTestsfastharnessuiscriptcontrolleruisidescriptwithcallbackexpectedtxtfromrev208815trunkLayoutTestsfastharnessuisidescriptunregistercallbackexpectedtxt"></a>
<div class="copfile"><h4>Copied: trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-script-with-callback-expected.txt (from rev 208815, trunk/LayoutTests/fast/harness/ui-side-script-unregister-callback-expected.txt) (0 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-script-with-callback-expected.txt                                (rev 0)
+++ trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-script-with-callback-expected.txt        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -0,0 +1,11 @@
</span><ins>+Test that a second immediate UI script returns if an earlier script registered a callback
+
+On success, you will see a series of &quot;PASS&quot; messages, followed by &quot;TEST COMPLETE&quot;.
+
+
+PASS scriptResult is &quot;async task complete&quot;
+PASS scriptResult is &quot;immediate script complete&quot;
+PASS successfullyParsed is true
+
+TEST COMPLETE
+
</ins></span></pre></div>
<a id="trunkLayoutTestsfastharnessuiscriptcontrolleruisidescriptwithcallbackhtmlfromrev208815trunkLayoutTestsfastharnessuisidescriptunregistercallbackhtml"></a>
<div class="copfile"><h4>Copied: trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-script-with-callback.html (from rev 208815, trunk/LayoutTests/fast/harness/ui-side-script-unregister-callback.html) (0 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-script-with-callback.html                                (rev 0)
+++ trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-script-with-callback.html        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -0,0 +1,62 @@
</span><ins>+&lt;!DOCTYPE html&gt;
+
+&lt;html&gt;
+&lt;head&gt;
+    &lt;script src=&quot;../../../resources/js-test-pre.js&quot;&gt;&lt;/script&gt;
+    &lt;script&gt;
+        
+        var jsTestIsAsync = true;
+        
+        function getAsyncTaskScript()
+        {
+            return `(function() {
+                uiController.willBeginZoomingCallback = function() {};
+
+                uiController.doAsyncTask(function() {
+                    uiController.uiScriptComplete('async task complete');
+                });
+            })();`;
+        }
+
+        function getImmediateScript()
+        {
+            return `(function() {
+                return 'immediate script complete';
+            })();`;
+        }
+    
+        var scriptResult;
+        function runTest()
+        {
+            description('Test that a second immediate UI script returns if an earlier script registered a callback');
+
+            if (!window.testRunner) {
+                debug('This test requires testRunner');
+                return;
+            }
+
+            if (!testRunner.runUIScript) {
+                debug('This test requires runUIScript');
+                return;
+            }
+
+            testRunner.runUIScript(getAsyncTaskScript(), function(result) {
+                scriptResult = result;
+                shouldBeEqualToString('scriptResult', 'async task complete');
+
+                testRunner.runUIScript(getImmediateScript(), function(result) {
+                    scriptResult = result;
+                    shouldBeEqualToString('scriptResult', 'immediate script complete');
+                    finishJSTest();
+                });
+            });
+        }
+        window.addEventListener('load', runTest, false);
+    &lt;/script&gt;
+&lt;/head&gt;
+&lt;body&gt;
+
+&lt;pre id=&quot;results&quot;&gt;&lt;/pre&gt;
+&lt;script src=&quot;../../../resources/js-test-post.js&quot;&gt;&lt;/script&gt;
+&lt;/body&gt;
+&lt;/html&gt;
</ins></span></pre></div>
<a id="trunkLayoutTestsfastharnessuiscriptcontrolleruisidescriptsexpectedtxtfromrev208815trunkLayoutTestsfastharnessuisidescriptsexpectedtxt"></a>
<div class="copfile"><h4>Copied: trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-scripts-expected.txt (from rev 208815, trunk/LayoutTests/fast/harness/ui-side-scripts-expected.txt) (0 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-scripts-expected.txt                                (rev 0)
+++ trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-scripts-expected.txt        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -0,0 +1,10 @@
</span><ins>+Running the UI-side script
+Completed async task 1.1.
+Completed async task 2.1.
+Completed async task 1.2.
+Completed async task 2.1.
+Completed async task 2.2.1.
+Completed async task 1.3.
+Completed async task 2.3.
+Completed async task 2.2.2.
+.
</ins></span></pre></div>
<a id="trunkLayoutTestsfastharnessuiscriptcontrolleruisidescriptshtmlfromrev208815trunkLayoutTestsfastharnessuisidescriptshtml"></a>
<div class="copfile"><h4>Copied: trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-scripts.html (from rev 208815, trunk/LayoutTests/fast/harness/ui-side-scripts.html) (0 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-scripts.html                                (rev 0)
+++ trunk/LayoutTests/fast/harness/uiscriptcontroller/ui-side-scripts.html        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -0,0 +1,85 @@
</span><ins>+&lt;!DOCTYPE html&gt;
+
+&lt;html&gt;
+&lt;head&gt;
+    &lt;script id=&quot;ui-script&quot; type=&quot;text/plain&quot;&gt;
+        (function() {
+            var completions = 'Running the UI-side script\n';
+            var outstandingTaskCount = 3;
+            
+            uiController.doAsyncTask(function() {
+                completions += 'Completed async task 1.1.\n';
+
+                uiController.doAsyncTask(function() {
+                    completions += 'Completed async task 1.2.\n';
+
+                    uiController.doAsyncTask(function() {
+                        completions += 'Completed async task 1.3.\n';
+
+                        --outstandingTaskCount;
+                        checkIfTasksFinished();
+                    });
+                });
+            });
+
+            uiController.doAsyncTask(function() {
+                completions += 'Completed async task 2.1.\n';
+
+                uiController.doAsyncTask(function() {
+                    completions += 'Completed async task 2.1.\n';
+
+                    uiController.doAsyncTask(function() {
+                        completions += 'Completed async task 2.3.\n';
+
+                        --outstandingTaskCount;
+                        checkIfTasksFinished();
+                    });
+                });
+
+                uiController.doAsyncTask(function() {
+                    completions += 'Completed async task 2.2.1.\n';
+
+                    uiController.doAsyncTask(function() {
+                        completions += 'Completed async task 2.2.2.\n';
+
+                        --outstandingTaskCount;
+                        checkIfTasksFinished();
+                    });
+                });
+            });
+            
+            function checkIfTasksFinished()
+            {
+                if (!outstandingTaskCount)
+                    uiController.uiScriptComplete(completions);
+            }
+        })();
+    &lt;/script&gt;
+
+    &lt;script&gt;
+        if (window.testRunner) {
+            testRunner.dumpAsText();
+            testRunner.waitUntilDone();
+        }
+
+        function runTest()
+        {
+            if (testRunner.runUIScript) {
+                var uiScript = document.getElementById('ui-script').text;
+                testRunner.runUIScript(uiScript, function(result) {
+                    document.getElementById('result').textContent = result;
+                    testRunner.notifyDone();
+                });
+            }
+        }
+
+        window.addEventListener('load', runTest, false);
+    &lt;/script&gt;
+&lt;/head&gt;
+&lt;body&gt;
+
+&lt;pre id=&quot;result&quot;&gt;This test has to run in iOS WebKitTestRunner.&lt;/pre&gt;
+
+&lt;/body&gt;
+&lt;/html&gt;
+.
</ins><span class="cx">\ No newline at end of file
</span></span></pre></div>
<a id="trunkLayoutTestsplatformmacTestExpectations"></a>
<div class="modfile"><h4>Modified: trunk/LayoutTests/platform/mac/TestExpectations (208815 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/LayoutTests/platform/mac/TestExpectations        2016-11-16 22:53:48 UTC (rev 208815)
+++ trunk/LayoutTests/platform/mac/TestExpectations        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -25,8 +25,7 @@
</span><span class="cx"> 
</span><span class="cx"> fast/attachment/attachment-subtitle-resize.html [ Pass ]
</span><span class="cx"> 
</span><del>-fast/harness/ui-side-scripts.html [ Pass ]
-fast/harness/concurrent-ui-side-scripts.html [ Pass ]
</del><ins>+fast/harness/uiscriptcontroller [ Pass ]
</ins><span class="cx"> 
</span><span class="cx"> #//////////////////////////////////////////////////////////////////////////////////////////
</span><span class="cx"> # End platform-specific directories.
</span></span></pre></div>
<a id="trunkToolsChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Tools/ChangeLog (208815 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Tools/ChangeLog        2016-11-16 22:53:48 UTC (rev 208815)
+++ trunk/Tools/ChangeLog        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -1,3 +1,19 @@
</span><ins>+2016-11-16  Simon Fraser  &lt;simon.fraser@apple.com&gt;
+
+        UIScriptController: script with no async tasks fails if an earlier script registered a callback
+        https://bugs.webkit.org/show_bug.cgi?id=164762
+
+        Reviewed by Wenson Hsieh.
+        
+        Make TestRunner::callUIScriptCallback() async in DumpRenderTree to match WebKitTestRunner behavior.
+        This fixes ui-side-script-with-callback.html in WK1, which failed because the second runUIScript()
+        would occur inside the completion callback from the first. This no longer happens.
+
+        * DumpRenderTree/TestRunner.cpp:
+        (TestRunner::callUIScriptCallback):
+        * TestRunnerShared/UIScriptContext/UIScriptContext.cpp:
+        (UIScriptContext::tryToCompleteUIScriptForCurrentParentCallback):
+
</ins><span class="cx"> 2016-11-16  Ryan Haddad  &lt;ryanhaddad@apple.com&gt;
</span><span class="cx"> 
</span><span class="cx">         Unreviewed, rolling out r208770.
</span></span></pre></div>
<a id="trunkToolsDumpRenderTreeTestRunnercpp"></a>
<div class="modfile"><h4>Modified: trunk/Tools/DumpRenderTree/TestRunner.cpp (208815 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Tools/DumpRenderTree/TestRunner.cpp        2016-11-16 22:53:48 UTC (rev 208815)
+++ trunk/Tools/DumpRenderTree/TestRunner.cpp        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -51,6 +51,7 @@
</span><span class="cx"> #include &lt;wtf/LoggingAccumulator.h&gt;
</span><span class="cx"> #include &lt;wtf/MathExtras.h&gt;
</span><span class="cx"> #include &lt;wtf/RefPtr.h&gt;
</span><ins>+#include &lt;wtf/RunLoop.h&gt;
</ins><span class="cx"> #include &lt;wtf/StdLibExtras.h&gt;
</span><span class="cx"> #include &lt;wtf/text/WTFString.h&gt;
</span><span class="cx"> 
</span><span class="lines">@@ -2392,9 +2393,13 @@
</span><span class="cx"> 
</span><span class="cx"> void TestRunner::callUIScriptCallback(unsigned callbackID, JSStringRef result)
</span><span class="cx"> {
</span><del>-    JSContextRef context = mainFrameJSContext();
-    JSValueRef resultValue = JSValueMakeString(context, result);
-    callTestRunnerCallback(callbackID, 1, &amp;resultValue);
</del><ins>+    JSRetainPtr&lt;JSStringRef&gt; protectedResult(result);
+    
+    RunLoop::main().dispatch([protectedThis = makeRef(*this), callbackID, protectedResult]() mutable {
+        JSContextRef context = protectedThis-&gt;mainFrameJSContext();
+        JSValueRef resultValue = JSValueMakeString(context, protectedResult.get());
+        protectedThis-&gt;callTestRunnerCallback(callbackID, 1, &amp;resultValue);
+    });
</ins><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> void TestRunner::uiScriptDidComplete(const String&amp; result, unsigned callbackID)
</span></span></pre></div>
<a id="trunkToolsTestRunnerSharedUIScriptContextUIScriptContextcpp"></a>
<div class="modfile"><h4>Modified: trunk/Tools/TestRunnerShared/UIScriptContext/UIScriptContext.cpp (208815 => 208816)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Tools/TestRunnerShared/UIScriptContext/UIScriptContext.cpp        2016-11-16 22:53:48 UTC (rev 208815)
+++ trunk/Tools/TestRunnerShared/UIScriptContext/UIScriptContext.cpp        2016-11-16 23:05:00 UTC (rev 208816)
</span><span class="lines">@@ -172,6 +172,12 @@
</span><span class="cx">     String scriptResult(JSStringGetCharactersPtr(result), JSStringGetLength(result));
</span><span class="cx"> 
</span><span class="cx">     m_delegate.uiScriptDidComplete(scriptResult, m_currentScriptCallbackID);
</span><ins>+    
+    // Unregister tasks associated with this callback
+    m_callbacks.removeIf([&amp;](auto&amp; keyAndValue) {
+        return keyAndValue.value.parentScriptCallbackID == m_currentScriptCallbackID;
+    });
+    
</ins><span class="cx">     m_currentScriptCallbackID = 0;
</span><span class="cx">     if (result)
</span><span class="cx">         JSStringRelease(result);
</span></span></pre>
</div>
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