Merge 107024 - Properly detect top level frames when propogating compositing

Source/WebCore/rendering/RenderLayerCompositor.cpp

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 1244 matching lines @@
     return view->platformWidget();
 #endif
     return false;
 }
 
 bool RenderLayerCompositor::shouldPropagateCompositingToEnclosingFrame() const
 {
     // Parent document content needs to be able to render on top of a composited frame, so correct behavior
     // is to have the parent document become composited too. However, this can cause problems on platforms that
     // use native views for frames (like Mac), so disable that behavior on those platforms for now.
-    HTMLFrameOwnerElement* ownerElement = enclosingFrameElement();
+    HTMLFrameOwnerElement* ownerElement = m_renderView->document()->ownerElement();
     RenderObject* renderer = ownerElement ? ownerElement->renderer() : 0;
 
     // If we are the top-level frame, don't propagate.
     if (!ownerElement)
         return false;
 
     if (!allowsIndependentlyCompositedFrames(m_renderView->frameView()))
         return true;
 
     if (!renderer || !renderer->isRenderPart())
@@ skipping 10 matching lines @@
     if (frameRenderer->widget()) {
         ASSERT(frameRenderer->widget()->isFrameView());
         FrameView* view = static_cast<FrameView*>(frameRenderer->widget());
         if (view->isOverlappedIncludingAncestors() || view->hasCompositingAncestor())
             return true;
     }
 
     return false;
 }
 
-HTMLFrameOwnerElement* RenderLayerCompositor::enclosingFrameElement() const
-{
-    if (HTMLFrameOwnerElement* ownerElement = m_renderView->document()->ownerElement())
-        return (ownerElement->hasTagName(iframeTag) || ownerElement->hasTagName(frameTag) || ownerElement->hasTagName(objectTag)) ? ownerElement : 0;
-
-    return 0;
-}
-
 bool RenderLayerCompositor::needsToBeComposited(const RenderLayer* layer) const
 {
     if (!canBeComposited(layer))
         return false;
 
     return requiresCompositingLayer(layer) || layer->mustOverlapCompositedLayers() || (inCompositingMode() && layer->isRootLayer());
 }
 
 // Note: this specifies whether the RL needs a compositing layer for intrinsic reasons.
 // Use needsToBeComposited() to determine if a RL actually needs a compositing layer.
@@ skipping 682 matching lines @@
     if (!viewLayer->isComposited())
         return;
 
     if (GraphicsLayer* rootLayer = viewLayer->backing()->graphicsLayer())
         rootLayer->noteDeviceOrPageScaleFactorChangedIncludingDescendants();
 }
 
 } // namespace WebCore
 
 #endif // USE(ACCELERATED_COMPOSITING)