Reviewed by Simon Fraser.

        Provide more fine grained control to ports over when to turn on accelerated
        compositing.
        https://bugs.webkit.org/show_bug.cgi?id=49998

        As part of this change, the old hasAcceleratedCompositing method on the ChromeClient
        has now been replaced by allowedCompositingTriggers which returns a bitfield of
        all the features which can trigger the compositor.

        * src/ChromeClientImpl.cpp:
        (WebKit::ChromeClientImpl::allowedCompositingTriggers):
        * src/ChromeClientImpl.h:
2010-11-29  Vangelis Kokkevis  <vangelis@chromium.org>

        Reviewed by Simon Fraser.

        Provide more fine grained control to ports over when to turn on accelerated
        compositing.
        https://bugs.webkit.org/show_bug.cgi?id=49998

        As part of this change, the old hasAcceleratedCompositing method on the ChromeClient
        has now been replaced by allowedCompositingTriggers which returns a bitfield of
        all the features which can trigger the compositor.


        * WebCoreSupport/ChromeClientQt.cpp:
        (WebCore::ChromeClientQt::allowedCompositingTriggers):
        * WebCoreSupport/ChromeClientQt.h:
2010-11-30  Vangelis Kokkevis  <vangelis@chromium.org>

        Reviewed by Simon Fraser.

        Provide more fine grained control to ports over when to turn on 
        accelerated compositing.
        https://bugs.webkit.org/show_bug.cgi?id=49998

        The RenderLayerCompositor now checks with the chrome client whether
        3d transforms, video, plugins, canvas and animation require
        switching over to the composited path. Layers that overlap composited
        content will still turn into composited layers regardless of the
        setting.

        * css/MediaQueryEvaluator.cpp:
        (WebCore::transform_3dMediaFeatureEval):
        * page/ChromeClient.h:
        (WebCore::ChromeClient::allowedCompositingTriggers):
        * rendering/RenderLayer.cpp:
        (WebCore::RenderLayer::canRender3DTransforms):
        (WebCore::RenderLayer::updateTransform):
        (WebCore::RenderLayer::currentTransform):
        * rendering/RenderLayer.h:
        * rendering/RenderLayerBacking.cpp:
        (WebCore::RenderLayerBacking::updateLayerTransform):
        * rendering/RenderLayerCompositor.cpp:
        (WebCore::RenderLayerCompositor::RenderLayerCompositor):
        (WebCore::RenderLayerCompositor::cacheAcceleratedCompositingFlags):
        (WebCore::RenderLayerCompositor::canRender3DTransforms):
        (WebCore::RenderLayerCompositor::requiresCompositingLayer):
        (WebCore::RenderLayerCompositor::requiresCompositingForTransform):
        (WebCore::RenderLayerCompositor::requiresCompositingForVideo):
        (WebCore::RenderLayerCompositor::requiresCompositingForCanvas):
        (WebCore::RenderLayerCompositor::requiresCompositingForPlugin):
        (WebCore::RenderLayerCompositor::requiresCompositingForAnimation):
        * rendering/RenderLayerCompositor.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@72954 268f45cc-cd09-0410-ab3c-d52691b4dbfc