[Webkit-unassigned] [Bug 229228] [WinCairo][GraphicsLayerTextureMapper] REGRESSION(r281102): ASSERTION FAILED: !isInAcceleratedCompositingMode() in incorporateUpdate

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229228

--- Comment #1 from Fujii Hironori <Hironori.Fujii at sony.com> ---
This assertion ensures DrawingAreaProxy::Update message is dispatched only if AC mode.
However, DrawingAreaProxy::Update message is dispatched while in AC mod in the following scenario.

1. DrawingAreaCoordinatedGraphics::exitAcceleratedCompositingMode calls DrawingAreaCoordinatedGraphics::display(WebKit::UpdateInfo&)
2. DrawingAreaCoordinatedGraphics::display(WebKit::UpdateInfo&) calls WebPage::updateRendering()
3. WebPage::updateRendering() executes JavaScript
4. JavaScript calls notifyDone
5. WTR::TestRunner::notifyDone calls WKBundlePageForceRepaint
6. DrawingAreaCoordinatedGraphics::display() dispatches the message

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