[Webkit-unassigned] [Bug 78872] [chromium] ScrollbarLayerChromium/CCScrollbarLayerImpl for CC-side scrollbar painting

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=78872





--- Comment #36 from Tien-Ren Chen <trchen at chromium.org>  2012-03-05 19:37:36 PST ---
(In reply to comment #35)
> (In reply to comment #34)
> The difference in frameRect() is intentional. The frameRect is relative to the GraphicsContext which the scrollbar will be drawn. In impl thread the scrollbar has its exclusive GraphicsContext, so the frameRect should be exactly the bound of the texture.
> 
> For the scroll range I feel the values reported from the main thread is weird. Seems like there is a viewport size change, and the new size is propagated to the layers before the Scrollbar. (means the values calculated from impl thread is more up-to-date)

CORRECT: viewport size change -> document size change

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