[Webkit-unassigned] [Bug 104990] New: Coordinated Graphics: Manage the lifecycle of CoordinatedGraphicsLayer explicitly.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=104990

           Summary: Coordinated Graphics: Manage the lifecycle of
                    CoordinatedGraphicsLayer explicitly.
           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, Web Process does not send a layer creation message to UI Process, so LayerTreeHost creates GraphicsLayer lazily.
It causes redundant if statements to check if GraphicsLayer is created. This patch manages the lifecycle of layer explicitly, and it increases readability.

This is in preparation for refactoring TextureMapper to work in an actor model (http://webkit.org/b/103854).

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