Add Blink APIs for frame tree mirroring.

Source/core/html/HTMLFrameOwnerElement.h

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. 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
@@ skipping 19 matching lines @@
 class DOMWindow;
 class ExceptionState;
 class Frame;
 class RenderPart;
 class Widget;
 
 class HTMLFrameOwnerElement : public HTMLElement, public FrameOwner {
 public:
     virtual ~HTMLFrameOwnerElement();
 
-    // FrameOwner overrides:
-    virtual bool isLocal() const { return true; }
-    virtual SandboxFlags sandboxFlags() const OVERRIDE { return m_sandboxFlags; }
-    virtual void dispatchLoad() OVERRIDE;
-
     Frame* contentFrame() const { return m_contentFrame; }
     DOMWindow* contentWindow() const;
     Document* contentDocument() const;
 
     void setContentFrame(Frame&);
     void clearContentFrame();
 
     void disconnectContentFrame();
 
     // Most subclasses use RenderPart (either RenderEmbeddedObject or RenderIFrame)
@@ skipping 26 matching lines @@
 protected:
     HTMLFrameOwnerElement(const QualifiedName& tagName, Document&);
     void setSandboxFlags(SandboxFlags);
 
     bool loadOrRedirectSubframe(const KURL&, const AtomicString& frameName, bool lockBackForwardList);
 
 private:
     virtual bool isKeyboardFocusable() const OVERRIDE;
     virtual bool isFrameOwnerElement() const OVERRIDE FINAL { return true; }
 
+    // FrameOwner overrides:
+    virtual bool isLocal() const { return true; }
+    virtual SandboxFlags sandboxFlags() const OVERRIDE { return m_sandboxFlags; }
+    virtual void dispatchLoad() OVERRIDE;
+
     Frame* m_contentFrame;
     RefPtr<Widget> m_widget;
     SandboxFlags m_sandboxFlags;
 };
 
 DEFINE_ELEMENT_TYPE_CASTS(HTMLFrameOwnerElement, isFrameOwnerElement());
 
 class SubframeLoadingDisabler {
 public:
     explicit SubframeLoadingDisabler(Node& root)
@@ skipping 26 matching lines @@
     }
 
     Node& m_root;
 };
 
 DEFINE_TYPE_CASTS(HTMLFrameOwnerElement, FrameOwner, owner, owner->isLocal(), owner.isLocal());
 
 } // namespace WebCore
 
 #endif // HTMLFrameOwnerElement_h