[Webkit-unassigned] [Bug 103215] New: Coordinated Graphics: Refactor code managing a backing store in LayerTreeRenderer.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=103215

           Summary: Coordinated Graphics: Refactor code managing a backing
                    store in LayerTreeRenderer.
           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 LayerTreeRenderer assign a content backing store to
TextureMapperLayer only in setLayerState(). Currently, createTile() can assign
the backing store to TextureMapperLayer and it can break the invariant condition
of TextureMapperLayer: TextureMapperLayer can have its own backing store only if
the layer has following conditions: drawsContent, contentsVisible and non empty
size.

In addition, the modified code about creating and removing a backing store
matches the same purpose code of CoordinatedGraphicsLayer and
GraphicsLayerTextureMapepr.

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