[Webkit-unassigned] [Bug 249796] New: "Frame End" timeline point is wrong with UI-side compositing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=249796

            Bug ID: 249796
           Summary: "Frame End" timeline point is wrong with UI-side
                    compositing
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: inspector-bugzilla-changes at group.apple.com

`InspectorTimelineAgent::internalStart` uses this mechanism to detect "frame end":

    m_frameStopObserver = makeUnique<RunLoopObserver>(static_cast<CFIndex>(RunLoopObserver::WellKnownRunLoopOrders::InspectorFrameEnd), [this]() {

This doesn't work with UI-side compositing (i.e. iOS, and future macOS), because a "frame" can extend over multiple turns of the CFRunLoop while we wait for backing store flushing (see where RemoteLayerTreeDrawingArea calls didCompleteRenderingUpdateDisplay()).

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