Add Blink APIs for frame tree mirroring.

Source/core/html/HTMLFrameOwnerElement.cpp

Index: Source/core/html/HTMLFrameOwnerElement.cpp
diff --git a/Source/core/html/HTMLFrameOwnerElement.cpp b/Source/core/html/HTMLFrameOwnerElement.cpp
index 965d6af1ab359d76896f91ffd258c74282dd187c..aae78ff2491650dcc119e32c59223aa758020287 100644
--- a/Source/core/html/HTMLFrameOwnerElement.cpp
+++ b/Source/core/html/HTMLFrameOwnerElement.cpp
@@ -98,20 +98,6 @@ HTMLFrameOwnerElement::HTMLFrameOwnerElement(const QualifiedName& tagName, Docum
 {
 }
 
-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)
 {
     // Make sure we will not end up with two frames referencing the same owner element.
@@ -135,6 +121,20 @@ void HTMLFrameOwnerElement::clearContentFrame()
         node->decrementConnectedSubframeCount();
 }
 
+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::disconnectContentFrame()
 {
     // FIXME: Currently we don't do this in removedFrom because this causes an