[Webkit-unassigned] [Bug 107059] New: Coordinated Graphics: Paint contents on a backing store when RenderLayerBacking requests.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=107059

           Summary: Coordinated Graphics: Paint contents on a backing
                    store when RenderLayerBacking requests.
           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: luxtella at company100.net


Currently, Coordinated Graphics can paint contents without a setNeedsDisplay request,
and sometimes Coordinated Graphics skips a setNeedsDisplay request.

This patch fixes above problems.
1. CoordinatedTile constructor does not set a dirty rect.
2. CoordinatedGraphicsLayer stores pending dirty rects and flushs in
updateContentBuffers() because CoordinatedGraphicsLayer creates a backing store
lazily.

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