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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/184210">184210</a></dd>
<dt>Author</dt> <dd>cdumez@apple.com</dd>
<dt>Date</dt> <dd>2015-05-12 12:29:42 -0700 (Tue, 12 May 2015)</dd>
</dl>

<h3>Log Message</h3>
<pre>[WK2] Log using diagnostic logging how far back in history we navigate
https://bugs.webkit.org/show_bug.cgi?id=144919
&lt;rdar://problem/20920043&gt;

Reviewed by Gavin Barraclough.

Source/WebCore:

Add diagnostic logging keys for logging back history navigation delta.

* page/DiagnosticLoggingKeys.cpp:
(WebCore::DiagnosticLoggingKeys::deltaKey):
(WebCore::DiagnosticLoggingKeys::backNavigationKey):
* page/DiagnosticLoggingKeys.h:

Source/WebKit2:

Log using diagnostic logging how far back in history we navigate.
When a back navigation or a backward indexed navigation occurs, we
log the delta: (HistoryListSize - 1) - NewHistoryItemIndex.

* UIProcess/WebBackForwardList.cpp:
(WebKit::WebBackForwardList::goToItem):</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCorepageDiagnosticLoggingKeyscpp">trunk/Source/WebCore/page/DiagnosticLoggingKeys.cpp</a></li>
<li><a href="#trunkSourceWebCorepageDiagnosticLoggingKeysh">trunk/Source/WebCore/page/DiagnosticLoggingKeys.h</a></li>
<li><a href="#trunkSourceWebKit2ChangeLog">trunk/Source/WebKit2/ChangeLog</a></li>
<li><a href="#trunkSourceWebKit2UIProcessWebBackForwardListcpp">trunk/Source/WebKit2/UIProcess/WebBackForwardList.cpp</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (184209 => 184210)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog        2015-05-12 19:23:51 UTC (rev 184209)
+++ trunk/Source/WebCore/ChangeLog        2015-05-12 19:29:42 UTC (rev 184210)
</span><span class="lines">@@ -1,3 +1,18 @@
</span><ins>+2015-05-12  Chris Dumez  &lt;cdumez@apple.com&gt;
+
+        [WK2] Log using diagnostic logging how far back in history we navigate
+        https://bugs.webkit.org/show_bug.cgi?id=144919
+        &lt;rdar://problem/20920043&gt;
+
+        Reviewed by Gavin Barraclough.
+
+        Add diagnostic logging keys for logging back history navigation delta.
+
+        * page/DiagnosticLoggingKeys.cpp:
+        (WebCore::DiagnosticLoggingKeys::deltaKey):
+        (WebCore::DiagnosticLoggingKeys::backNavigationKey):
+        * page/DiagnosticLoggingKeys.h:
+
</ins><span class="cx"> 2015-05-12  Yoav Weiss  &lt;yoav@yoav.ws&gt;
</span><span class="cx"> 
</span><span class="cx">         Avoid CSSPrimitiveValue allocation when parsing sizes
</span></span></pre></div>
<a id="trunkSourceWebCorepageDiagnosticLoggingKeyscpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/page/DiagnosticLoggingKeys.cpp (184209 => 184210)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/page/DiagnosticLoggingKeys.cpp        2015-05-12 19:23:51 UTC (rev 184209)
+++ trunk/Source/WebCore/page/DiagnosticLoggingKeys.cpp        2015-05-12 19:29:42 UTC (rev 184210)
</span><span class="lines">@@ -263,6 +263,11 @@
</span><span class="cx">     return ASCIILiteral(&quot;cannotSuspendActiveDOMObjects&quot;);
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+String DiagnosticLoggingKeys::deltaKey()
+{
+    return ASCIILiteral(&quot;delta&quot;);
+}
+
</ins><span class="cx"> String DiagnosticLoggingKeys::applicationCacheKey()
</span><span class="cx"> {
</span><span class="cx">     return ASCIILiteral(&quot;applicationCache&quot;);
</span><span class="lines">@@ -273,6 +278,11 @@
</span><span class="cx">     return ASCIILiteral(&quot;audio&quot;);
</span><span class="cx"> }
</span><span class="cx"> 
</span><ins>+String DiagnosticLoggingKeys::backNavigationKey()
+{
+    return ASCIILiteral(&quot;backNavigation&quot;);
+}
+
</ins><span class="cx"> String DiagnosticLoggingKeys::cacheControlNoStoreKey()
</span><span class="cx"> {
</span><span class="cx">     return ASCIILiteral(&quot;cacheControlNoStore&quot;);
</span></span></pre></div>
<a id="trunkSourceWebCorepageDiagnosticLoggingKeysh"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/page/DiagnosticLoggingKeys.h (184209 => 184210)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/page/DiagnosticLoggingKeys.h        2015-05-12 19:23:51 UTC (rev 184209)
+++ trunk/Source/WebCore/page/DiagnosticLoggingKeys.h        2015-05-12 19:29:42 UTC (rev 184210)
</span><span class="lines">@@ -34,9 +34,11 @@
</span><span class="cx"> public:
</span><span class="cx">     static String applicationCacheKey();
</span><span class="cx">     static String audioKey();
</span><ins>+    WEBCORE_EXPORT static String backNavigationKey();
</ins><span class="cx">     WEBCORE_EXPORT static String cacheControlNoStoreKey();
</span><span class="cx">     static String cachedResourceRevalidationKey();
</span><span class="cx">     static String cannotSuspendActiveDOMObjectsKey();
</span><ins>+    WEBCORE_EXPORT static String deltaKey();
</ins><span class="cx">     static String deniedByClientKey();
</span><span class="cx">     static String deviceMotionKey();
</span><span class="cx">     static String deviceOrientationKey();
</span></span></pre></div>
<a id="trunkSourceWebKit2ChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/ChangeLog (184209 => 184210)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/ChangeLog        2015-05-12 19:23:51 UTC (rev 184209)
+++ trunk/Source/WebKit2/ChangeLog        2015-05-12 19:29:42 UTC (rev 184210)
</span><span class="lines">@@ -1,3 +1,18 @@
</span><ins>+2015-05-12  Chris Dumez  &lt;cdumez@apple.com&gt;
+
+        [WK2] Log using diagnostic logging how far back in history we navigate
+        https://bugs.webkit.org/show_bug.cgi?id=144919
+        &lt;rdar://problem/20920043&gt;
+
+        Reviewed by Gavin Barraclough.
+
+        Log using diagnostic logging how far back in history we navigate.
+        When a back navigation or a backward indexed navigation occurs, we
+        log the delta: (HistoryListSize - 1) - NewHistoryItemIndex.
+
+        * UIProcess/WebBackForwardList.cpp:
+        (WebKit::WebBackForwardList::goToItem):
+
</ins><span class="cx"> 2015-05-11  Sam Weinig  &lt;sam@webkit.org&gt;
</span><span class="cx"> 
</span><span class="cx">         ChildProcess should take an os_activity
</span></span></pre></div>
<a id="trunkSourceWebKit2UIProcessWebBackForwardListcpp"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebKit2/UIProcess/WebBackForwardList.cpp (184209 => 184210)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebKit2/UIProcess/WebBackForwardList.cpp        2015-05-12 19:23:51 UTC (rev 184209)
+++ trunk/Source/WebKit2/UIProcess/WebBackForwardList.cpp        2015-05-12 19:29:42 UTC (rev 184210)
</span><span class="lines">@@ -29,6 +29,7 @@
</span><span class="cx"> #include &quot;APIArray.h&quot;
</span><span class="cx"> #include &quot;SessionState.h&quot;
</span><span class="cx"> #include &quot;WebPageProxy.h&quot;
</span><ins>+#include &lt;WebCore/DiagnosticLoggingKeys.h&gt;
</ins><span class="cx"> 
</span><span class="cx"> namespace WebKit {
</span><span class="cx"> 
</span><span class="lines">@@ -175,6 +176,12 @@
</span><span class="cx">     if (targetIndex == notFound)
</span><span class="cx">         return;
</span><span class="cx"> 
</span><ins>+    if (targetIndex &lt; m_currentIndex) {
+        unsigned delta = m_entries.size() - targetIndex - 1;
+        String deltaValue = delta &gt; 10 ? ASCIILiteral(&quot;over10&quot;) : String::number(delta);
+        m_page-&gt;logDiagnosticMessageWithValue(WebCore::DiagnosticLoggingKeys::backNavigationKey(), WebCore::DiagnosticLoggingKeys::deltaKey(), deltaValue, false /* shouldSample */);
+    }
+
</ins><span class="cx">     // If we're going to an item different from the current item, ask the client if the current
</span><span class="cx">     // item should remain in the list.
</span><span class="cx">     WebBackForwardListItem* currentItem = m_entries[m_currentIndex].get();
</span></span></pre>
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