[Webkit-unassigned] [Bug 216591] New: REGRESSION(r266677): ASSERTION FAILED in PaintFrequencyTracker::end()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216591

            Bug ID: 216591
           Summary: REGRESSION(r266677): ASSERTION FAILED in
                    PaintFrequencyTracker::end()
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: sabouhallawa at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Painting RenderLayers can be called from code paths which do not schedule RenderingUpdate through RenderingUpdateScheduler. This means RenderLayer::paintLayerContents() may be called while Page::updateRendering() is not on the call stack. This will make timestampForPaintFrequencyTracking() returns zero in this case. So PaintFrequencyTracker::end() will fail the assertion ASSERT(m_firstPaintTime). An example for this case is taking a snapshot of the page, or calling FrameView::paintContentsForSnapshot(). Another example is updating control tints or calling FrameView::updateControlTints().

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