[Webkit-unassigned] [Bug 87080] New: Use the same animation begin time while updating compositng layers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=87080

           Summary: Use the same animation begin time while updating
                    compositng layers
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simon.fraser at apple.com
                CC: dino at apple.com, jamesr at chromium.org, enne at google.com


RenderLayerCompositor::updateCompositingLayers() ends up calling code that relies on the current state of animations, via calls to RenderLayer::currentTransform(). This is called while mapping layer bounds to absolute coordinates, for overlap testing.

We should treat the entire compositing layer update as one animation batch (begin/end animation update). Without this, it's impossible to compare the results of coordinate mapping via two different code paths in ASSERTs. It seems reasonable to do anyway.

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