[Webkit-unassigned] [Bug 102896] New: Coordinated Graphics: refactor changing children code in CoordinatedGraphicsLayer.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=102896

           Summary: Coordinated Graphics: refactor changing children code
                    in CoordinatedGraphicsLayer.
           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


When changing children, we don't need to sync a layer state. We were confused
that we have to send a parent layer id to UI Process, but r133605 clarified 
passing the parent id is not necessary. So this patch removes
didChangeLayerState() in methods which change children.

In addition, purgeBackingStores() does not need to call didChangeChildren() 
because purgeBackingStores() does not change children.

r133605 is Bug 101142.

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