Web Inspector: timelines should not count time elapsed while paused in the debugger
https://bugs.webkit.org/show_bug.cgi?id=136351

Reviewed by Timothy Hatcher.

Source/JavaScriptCore:

Now that we have a stopwatch to provide pause-aware timing data, we can remove the
profiler's handling of debugger pause/continue callbacks. The debugger agent accounts
for suspended execution by pausing and resuming the stopwatch.

* API/JSProfilerPrivate.cpp:
(JSStartProfiling): Use a fresh stopwatch when profiling from the JSC API.
* inspector/InspectorEnvironment.h:
* inspector/JSGlobalObjectInspectorController.cpp:
(Inspector::JSGlobalObjectInspectorController::JSGlobalObjectInspectorController):
(Inspector::JSGlobalObjectInspectorController::executionStopwatch):
* inspector/JSGlobalObjectInspectorController.h:
* inspector/ScriptDebugServer.cpp:
(Inspector::ScriptDebugServer::handlePause):
* inspector/agents/InspectorDebuggerAgent.cpp:
(Inspector::InspectorDebuggerAgent::didPause):
(Inspector::InspectorDebuggerAgent::breakpointActionProbe):
(Inspector::InspectorDebuggerAgent::didContinue):
* inspector/agents/InspectorDebuggerAgent.h:
* profiler/LegacyProfiler.cpp:
(JSC::LegacyProfiler::profiler): Use nullptr.
(JSC::LegacyProfiler::startProfiling): Hand off a stopwatch to the profile generator.
(JSC::LegacyProfiler::stopProfiling): Use nullptr.
(JSC::LegacyProfiler::didPause): Deleted.
(JSC::LegacyProfiler::didContinue): Deleted.
* profiler/LegacyProfiler.h:
* profiler/Profile.cpp: The root node should always have a start time of 0.0.
(JSC::Profile::Profile):
* profiler/ProfileGenerator.cpp: Remove debugger pause/continue callbacks and the
timestamp member that was used to track time elapsed by the debugger. Just use the
stopwatch's elapsed times to generate start/elapsed times for function calls.

(JSC::ProfileGenerator::create):
(JSC::ProfileGenerator::ProfileGenerator):
(JSC::AddParentForConsoleStartFunctor::operator()): The parent node of |console.profile|
should have a start time of 0.0, since it represents the starting node of profiling.

(JSC::ProfileGenerator::beginCallEntry):
(JSC::ProfileGenerator::endCallEntry):
(JSC::ProfileGenerator::didPause): Deleted.
(JSC::ProfileGenerator::didContinue): Deleted.
* profiler/ProfileGenerator.h:

Source/WebCore:

To avoid counting time elapsed while the debugger is paused, timeline records should
keep track of time elapsed since the start of timeline capturing, rather than wall clock
timestamps. We can easily compute elapsed time by sharing a Stopwatch instance through the
inspector environment. The stopwatch runs with timelines and is paused with the debugger,
so subsequent time measurements will not include time elapsed while the debugger is paused.

This refactoring is safe because start and end times are only used to graph records; the
timestamp's actual value is irrelevant and is not displayed in the user interface. Date
timestamps are still included with network-related records as part of their header data.

No new tests, because we cannot reliably test timing changes induced by debugger pauses.
It is possible for records to accrue time before the debugger pauses or after it resumes.

* inspector/InspectorCSSAgent.cpp: Remove unnecessary include.
* inspector/InspectorController.cpp:
(WebCore::InspectorController::InspectorController):
(WebCore::InspectorController::executionStopwatch): Add a shared stopwatch.
* inspector/InspectorController.h:
* inspector/InspectorPageAgent.cpp:
(WebCore::InspectorPageAgent::timestamp): Redirect to the shared stopwatch.
(WebCore::InspectorPageAgent::domContentEventFired):
(WebCore::InspectorPageAgent::loadEventFired):
* inspector/InspectorPageAgent.h:
* inspector/InspectorResourceAgent.cpp:
(WebCore::InspectorResourceAgent::timestamp): Redirect to the shared stopwatch.
(WebCore::InspectorResourceAgent::willSendRequest):
(WebCore::InspectorResourceAgent::didReceiveResponse):
(WebCore::InspectorResourceAgent::didReceiveData):
(WebCore::InspectorResourceAgent::didFinishLoading):
(WebCore::InspectorResourceAgent::didFailLoading):
(WebCore::InspectorResourceAgent::didLoadResourceFromMemoryCache):
(WebCore::InspectorResourceAgent::willSendWebSocketHandshakeRequest):
(WebCore::InspectorResourceAgent::didReceiveWebSocketHandshakeResponse):
(WebCore::InspectorResourceAgent::didCloseWebSocket):
(WebCore::InspectorResourceAgent::didReceiveWebSocketFrame):
(WebCore::InspectorResourceAgent::didSendWebSocketFrame):
(WebCore::InspectorResourceAgent::didReceiveWebSocketFrameError):
* inspector/InspectorResourceAgent.h:
* inspector/InspectorTimelineAgent.cpp:
(WebCore::InspectorTimelineAgent::internalStart): Start and stop the stopwatch with timelines.
(WebCore::InspectorTimelineAgent::internalStop):
(WebCore::InspectorTimelineAgent::timestamp): Redirect to the shared stopwatch.
(WebCore::startProfiling):
(WebCore::InspectorTimelineAgent::startFromConsole):
(WebCore::InspectorTimelineAgent::willCallFunction):
(WebCore::InspectorTimelineAgent::willEvaluateScript):
(WebCore::TimelineTimeConverter::reset): Deleted.
* inspector/InspectorTimelineAgent.h:
(WebCore::TimelineTimeConverter::TimelineTimeConverter): Deleted.
(WebCore::TimelineTimeConverter::fromMonotonicallyIncreasingTime): Deleted.
(WebCore::InspectorTimelineAgent::timeConverter): Deleted.
* inspector/TimelineRecordFactory.cpp:
* inspector/WorkerInspectorController.cpp:
(WebCore::WorkerInspectorController::WorkerInspectorController):
(WebCore::WorkerInspectorController::executionStopwatch): Add a shared stopwatch.
* inspector/WorkerInspectorController.h:

Source/WebInspectorUI:

Don't update the timeline's current time when the debugger is paused.

Start and end times for timeline records are now in seconds elapsed since timeline
recording started, rather than milliseconds since the epoch. Also convert code that
tracks page/resource load timings to use elapsed times rather than timestamps.

Add a workaround to preserve compatibility with old backends. Convert legacy timestamps
in multiple agents to elapsed times.

* UserInterface/Controllers/FrameResourceManager.js:
(WebInspector.FrameResourceManager.prototype.resourceRequestWillBeSent):
(WebInspector.FrameResourceManager.prototype.resourceRequestWasServedFromMemoryCache):
(WebInspector.FrameResourceManager.prototype.resourceRequestDidReceiveResponse):
(WebInspector.FrameResourceManager.prototype.resourceRequestDidReceiveData):
(WebInspector.FrameResourceManager.prototype.resourceRequestDidFinishLoading):
(WebInspector.FrameResourceManager.prototype.resourceRequestDidFailLoading):
(WebInspector.FrameResourceManager.prototype._addNewResourceToFrame):
* UserInterface/Controllers/ProbeManager.js:
* UserInterface/Controllers/TimelineManager.js:
(WebInspector.TimelineManager.prototype.computeElapsedTime): Forward to the active TimelineRecording.
(WebInspector.TimelineManager.prototype.eventRecorded.processRecord):
(WebInspector.TimelineManager.prototype.eventRecorded):
(WebInspector.TimelineManager.prototype.pageDidLoad):
(WebInspector.TimelineManager.prototype._loadNewRecording):
* UserInterface/Models/Probe.js:
(WebInspector.ProbeSample):
* UserInterface/Models/Resource.js:
(WebInspector.Resource.prototype.updateForRedirectResponse):
(WebInspector.Resource.prototype.updateForResponse):
(WebInspector.Resource.prototype.increaseSize):
(WebInspector.Resource.prototype.markAsFinished):
(WebInspector.Resource.prototype.markAsFailed):
(WebInspector.Resource.prototype.revertMarkAsFinished):
* UserInterface/Models/TimelineRecording.js:
(WebInspector.TimelineRecording.prototype.computeElapsedTime):
* UserInterface/Views/TimelineContentView.js:
(WebInspector.TimelineContentView.prototype._debuggerPaused):
(WebInspector.TimelineContentView.prototype._debuggerResumed):

Source/WTF:

* WTF.vcxproj/WTF.vcxproj:
* WTF.vcxproj/WTF.vcxproj.filters:
* WTF.xcodeproj/project.pbxproj:
* wtf/CMakeLists.txt:
* wtf/Stopwatch.h: Added. This implements a refcounted monotonic stopwatch.
(WTF::Stopwatch::create):
(WTF::Stopwatch::Stopwatch):
(WTF::Stopwatch::reset):
(WTF::Stopwatch::start):
(WTF::Stopwatch::stop):
(WTF::Stopwatch::elapsedTime):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@175203 268f45cc-cd09-0410-ab3c-d52691b4dbfc