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

Source/core/rendering/RenderLayerCompositor.cpp

Index: Source/core/rendering/RenderLayerCompositor.cpp
diff --git a/Source/core/rendering/RenderLayerCompositor.cpp b/Source/core/rendering/RenderLayerCompositor.cpp
index 49d77c94619a7d8472518a81ee73c804cc72a9a5..0158c99442fc08fe9355e6a3d0d787b8f37ebe83 100644
--- a/Source/core/rendering/RenderLayerCompositor.cpp
+++ b/Source/core/rendering/RenderLayerCompositor.cpp
@@ -1673,6 +1673,9 @@ bool RenderLayerCompositor::requiresCompositingForFrame(RenderObject* 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;