[Webkit-unassigned] [Bug 102664] New: Coordinated Graphics: refactor syncCanvas to handle the lifecycle clearly.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=102664

           Summary: Coordinated Graphics: refactor syncCanvas to handle
                    the lifecycle clearly.
           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


This patch makes sync canvas code handle the lifecycle of the canvas
GraphicsSurface in the similar style to a directly image compositing and an
update atlas code. In conclusion, this patch moves the canvas lifecycle handling
code from LayerTreeRenderer to CoordinatedGraphicsLayer, because
CoordinatedGraphicsLayer knows best when to create and remove the canvas
GraphicsSurface.

After this patch, we can remove the canvas GraphicsSurface in UI Process as soon
as the canvas platform layer is unset in Web Process.

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