[Webkit-unassigned] [Bug 109645] New: Coordinated Graphics: a long page is scaled vertically while loading.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=109645

           Summary: Coordinated Graphics: a long page is scaled vertically
                    while loading.
           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 loading http://www.w3.org/TR/xpath-datamodel/, Coordinated Graphics draws vertically scaled contents.
It is because there is the difference between the size of a layer and the size of CoordinatedBackingStore.

Currently, CoordinatedGraphicsScene notifies the size to CoordinatedBackingStore at the moment of creating, updating and removing a tile. However, it is not necessary to send tile related messages when the size of layer is changed.
So this patch resets the size of CoordinatedBackingStore when receiving the message that is created when the size is changed: SyncLayerState.

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