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

Source/core/rendering/RenderPart.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #include "config.h"
 #include "core/rendering/RenderPart.h"
 
+#include "core/frame/Frame.h"
+#include "core/frame/FrameView.h"
 #include "core/html/HTMLFrameElementBase.h"
-#include "core/frame/FrameView.h"
 #include "core/plugins/PluginView.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderView.h"
 #include "core/rendering/svg/RenderSVGRoot.h"
 
 using namespace std;
 
 namespace WebCore {
 
@@ skipping 38 matching lines @@
     // renderer and the plugin has a layer, then we need a layer. Second, if this is
     // a renderer with a contentDocument and that document needs a layer, then we need
     // a layer.
     if (widget() && widget()->isPluginView() && toPluginView(widget())->platformLayer())
         return true;
 
     if (!node() || !node()->isFrameOwnerElement())
         return false;
 
     HTMLFrameOwnerElement* element = toHTMLFrameOwnerElement(node());
+    if (element->contentFrame() && element->contentFrame()->remotePlatformLayer())
+        return true;
+
     if (Document* contentDocument = element->contentDocument()) {
         if (RenderView* view = contentDocument->renderView())
             return view->usesCompositing();
     }
 
     return false;
 }
 
 bool RenderPart::needsPreferredWidthsRecalculation() const
 {
@@ skipping 41 matching lines @@
             Scrollbar* frameScrollbar = childFrameView->scrollbarAtPoint(newHitTestLocation.roundedPoint());
             if (frameScrollbar)
                 result.setScrollbar(frameScrollbar);
         }
     }
 
     return RenderWidget::nodeAtPoint(request, result, locationInContainer, accumulatedOffset, action);
 }
 
 }