[Webkit-unassigned] [Bug 55257] Support creating compositing layers for scrollable and overflowing objects

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=55257





--- Comment #7 from Daniel Sievers <sievers at google.com>  2011-03-03 17:46:38 PST ---
I have made the following changes:

* added layout tests with expected output (graphics layer tree).
I had problems adding a runtime property to LayoutTestController::overridePreference(), because RenderLayerCompositor() caches m_compositingTriggers when it is first created so triggering a change from Javascript won't propagate properly. Therefore I have marked the tests as SKIPPED for now.

* In RenderLayerCompositor::requiresCompositingForScrollableOverflow() I have moved the root layer check up so that we don't always set m_compositingDependsOnGeometry.

* I have overwritten canBeProgramaticallyScrolled() for RenderView so that it correctly returns false now for frames and iframes with the 'scrolling' attribute set to 'no', and we don't create an unwanted layer.

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