[Webkit-unassigned] [Bug 107084] New: Coordinated Graphics: Remove redundant behaviors in LayerTreeRenderer.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=107084

           Summary: Coordinated Graphics: Remove redundant behaviors 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


There are two changes.
1. It is redundant to call GraphicsLayer::removeFromParent() or GraphicsLayer::removeAllChildren() before deleting GraphicsLayer, because the destructor of GraphicsLayerTextureMapper does those.
2. LayerTreeRenderer::setRootLayerID() does not need to remove all children of rootLayer because this method can be called only once.

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