Add Blink APIs for frame tree mirroring.

Source/core/html/HTMLFrameOwnerElement.cpp

 /*
  * 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 80 matching lines @@
 }
 
 HTMLFrameOwnerElement::HTMLFrameOwnerElement(const QualifiedName& tagName, Document& document)
     : HTMLElement(tagName, document)
     , m_contentFrame(0)
     , m_widget(nullptr)
     , m_sandboxFlags(SandboxNone)
 {
 }
 
-void HTMLFrameOwnerElement::dispatchLoad()
-{
-    dispatchEvent(Event::create(EventTypeNames::load));
-}
-
 RenderPart* HTMLFrameOwnerElement::renderPart() const
 {
     // HTMLObjectElement and HTMLEmbedElement may return arbitrary renderers
     // when using fallback content.
     if (!renderer() || !renderer()->isRenderPart())
         return 0;
     return toRenderPart(renderer());
 }
 
 void HTMLFrameOwnerElement::setContentFrame(Frame& frame)
@@ skipping 52 matching lines @@
 void HTMLFrameOwnerElement::setSandboxFlags(SandboxFlags flags)
 {
     m_sandboxFlags = flags;
 }
 
 bool HTMLFrameOwnerElement::isKeyboardFocusable() const
 {
     return m_contentFrame && HTMLElement::isKeyboardFocusable();
 }
 
+void HTMLFrameOwnerElement::dispatchLoad()
+{
+    dispatchEvent(Event::create(EventTypeNames::load));
+}
+
 Document* HTMLFrameOwnerElement::getSVGDocument(ExceptionState& exceptionState) const
 {
     Document* doc = contentDocument();
     if (doc && doc->isSVGDocument())
         return doc;
     return 0;
 }
 
 void HTMLFrameOwnerElement::setWidget(PassRefPtr<Widget> widget)
 {
@@ skipping 78 matching lines @@
     // FIXME: In this case the LocalFrame will have finished loading before
     // it's being added to the child list. It would be a good idea to
     // create the child first, then invoke the loader separately.
     if (childFrame->loader().state() == FrameStateComplete && !childFrame->loader().policyDocumentLoader())
         childFrame->loader().checkCompleted();
     return true;
 }
 
 
 } // namespace WebCore