[Webkit-unassigned] [Bug 109560] Implement coordinated scrollbar for subframes and sublayers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=109560





--- Comment #9 from Tien-Ren Chen <trchen at chromium.org>  2013-02-12 21:15:40 PST ---
Changes from last patch:
1. Fix the crashes (scroll layer dangling pointer) -- now we create WebScrollbarLayer if and only if there is a corresponding scrollbar GraphicsLayer, but only actually attach the layer when a scroll layer is available.
2. Fix the coding style problem smfr@ mentioned
3. Change TestExpectations

(In reply to comment #7)
> As far as I can see, implementations of GraphicsLayer do not do anything different for setContentsToMedia(PlatformLayer*) and setContentsToCanvas(PlatformLayer*). GraphicsLayerCA and GraphicsLayerChromium set the contentsLayerPurpose, but this doesn't appear to be used for anything.  I think we should just fold them together into one function that accepts any sort of PlatformLayer.

I feel this patch is already too big to review. Let's do it in a separate bug: https://bugs.webkit.org/show_bug.cgi?id=109658

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