Attach a WebLayer to a frame element for out-of-process iframes.

Source/core/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 1655 matching lines @@
 bool RenderLayerCompositor::requiresCompositingForFrame(RenderObject* renderer) const
 {
     if (!renderer->isRenderPart())
         return false;
 
     RenderPart* frameRenderer = toRenderPart(renderer);
 
     if (!frameRenderer->requiresAcceleratedCompositing())
         return false;
 
+    if ((frameRenderer->isRenderIFrame() || frameRenderer->isFrame()) && frameRenderer->node() && toHTMLFrameOwnerElement(frameRenderer->node())->contentFrame() && toHTMLFrameOwnerElement(frameRenderer->node())->contentFrame()->platformLayer())

[eseidel, 2013/12/11 18:50:01]

Same problem as before.  Maybe we should have a helper:

PlatformLayer* layer = remoteWebLayer(renderer)

[kenrb, 2013/12/11 22:44:56]

I don't see a convenient place to put that helper. The lookups are in different
places.

+        return true;
+
     // FIXME: this seems bogus. If we don't know the layout position/size of the frame yet, wouldn't that be handled elsehwere?
     m_needsToRecomputeCompositingRequirements = true;
 
     RenderLayerCompositor* innerCompositor = frameContentsCompositor(frameRenderer);
     if (!innerCompositor)
         return false;
 
     // If we can't reliably know the size of the iframe yet, don't change compositing state.
     if (renderer->needsLayout())
         return frameRenderer->hasLayer() && frameRenderer->layer()->hasCompositedLayerMapping();
@@ skipping 790 matching lines @@
     } else if (graphicsLayer == m_scrollLayer.get()) {
         name = "Frame Scrolling Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace WebCore