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..9939d714cc600000bef76fd7c91cda21f91ed0b7 100644
--- a/Source/core/html/HTMLFrameOwnerElement.cpp
+++ b/Source/core/html/HTMLFrameOwnerElement.cpp
@@ -98,11 +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
@@ -175,6 +170,11 @@ 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();