Nondeterminism in window.postMessage between unrelated iframes

[burg]

Background: https://developer.mozilla.org/en-US/docs/Web/API/Window.postMessage

It sometimes is used on http://www.eyecon.ro/colorpicker/, in particular on the zrt_lookup.html iframe.

It should be straightforward to capture and replay this.

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ReplayEvents         --->Dispatching DOM event: type=load, target=0/node[0x7faa47a1a8a0] IMG
                     --->---> Function Call: http://www.google-analytics.com/urchin.js:226, target=0/frame[0x7faa41820f30]
ReplayEvents         --->Dispatching DOM event: type=message, target=1/window[0x7faa47e929f0] http://www.eyecon.ro/colorpicker/
ASSERTION FAILED: withinInputExtent()
/Users/burg/repos/timelapse/Source/WebCore/replay/CaptureInputIterator.cpp(89) : virtual void WebCore::CaptureInputIterator::incrementExecutionTicks()
1   0x10dc00e50 WTFCrash
2   0x1106b14e5 WebCore::CaptureInputIterator::incrementExecutionTicks()
3   0x1106a92a9 WebCore::ReplayController::willDispatchEvent(WebCore::Event const&, WebCore::Frame*, WebCore::PositionMark const&)
4   0x1106af384 WebCore::InspectorReplayAgent::willDispatchEvent(WebCore::Event const&, WebCore::Frame*)
5   0x10f66c2c4 WebCore::InspectorInstrumentation::willDispatchEventImpl(WebCore::InstrumentingAgents*, WebCore::Event const&, bool, WebCore::Document*)
6   0x10f1b54c5 WebCore::InspectorInstrumentation::willDispatchEvent(WebCore::Document*, WebCore::Event const&, bool)
7   0x10f1b4cc5 WebCore::EventTarget::fireEventListeners(WebCore::Event*, WebCore::EventTargetData*, WTF::Vector<WebCore::RegisteredEventListener, 1ul, WTF::CrashOnOverflow>&)
8   0x10f1b472e WebCore::EventTarget::fireEventListeners(WebCore::Event*)
9   0x10f1b45a7 WebCore::EventTarget::dispatchEvent(WTF::PassRefPtr<WebCore::Event>)
10  0x10f0fe27b WebCore::DOMWindow::dispatchMessageEventWithOriginCheck(WebCore::SecurityOrigin*, WTF::PassRefPtr<WebCore::Event>, WTF::PassRefPtr<WebCore::ScriptCallStack>)
11  0x10f0fe02c WebCore::DOMWindow::postMessageTimerFired(WTF::PassOwnPtr<WebCore::PostMessageTimer>)
12  0x10f10dd03 WebCore::PostMessageTimer::fired()
13  0x1104e2543 WebCore::ThreadTimers::sharedTimerFiredInternal()
14  0x1104e2259 WebCore::ThreadTimers::sharedTimerFired()
15  0x110270e73 WebCore::timerFired(__CFRunLoopTimer*, void*)
16  0x7fff8ed6b804 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__

[burg]

Strategy: make a new ReplayableTimer class, and have it be registered with AsyncEventProxy. Destruction causes unregistration (?). This should probably happen for network resources too.