[Webkit-unassigned] [Bug 145626] New: Non-deterministic Inspector Pause and Resume events makes tests flaky

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=145626

            Bug ID: 145626
           Summary: Non-deterministic Inspector Pause and Resume events
                    makes tests flaky
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mark.lam at apple.com
                CC: graouts at webkit.org, joepeck at webkit.org,
                    jonowells at apple.com, mattbaker at apple.com,
                    nvasilyev at apple.com, timothy at apple.com,
                    webkit-bug-importer at group.apple.com

DebuggerManager.debuggerDidResume() defers the dispatch of the Resumed event.  DebuggerManager.debuggerDidPause() can eat that Resumed event as well as the next Paused Event if debuggerDidPause() happens to be called before debuggerDidResume()'s delayedWork() fires.  As a result, we can cannot write tests that can depend on a consistent order of Pause and Resume events.

I was advised to use the CallFramesDidChange event instead.  The problem with this is that the number of CallFramesDidChange events firing also depends on the race between debuggerDidPause() and debuggerDidResume()'s delayedWork().  For example, the regression test of https://bugs.webkit.org/show_bug.cgi?id=145525 (which is currently written to assume that some Paused and Resume events will be eaten) runs fine on WK1 using DumpRenderTree.  When we run it on WK2 using WKRT which runs a lot slower, the events don't get eaten.  As a result, the test fails.

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