Plumbing toward transitioning remote frame back to a local frame.

Source/core/frame/Frame.h

Index: Source/core/frame/Frame.h
diff --git a/Source/core/frame/Frame.h b/Source/core/frame/Frame.h
index 997a1893fe3070ba136d79e8f8a593e942f36c33..4de75697368724a9d39588a167b869f3e4d3a1c7 100644
--- a/Source/core/frame/Frame.h
+++ b/Source/core/frame/Frame.h
@@ -36,16 +36,20 @@
 namespace blink {
 
 class ChromeClient;
+class Document;
 class FrameClient;
 class FrameHost;
 class FrameOwner;
 class HTMLFrameOwnerElement;
 class LocalDOMWindow;
+class KURL;
 class Page;
 class RenderPart;
 class Settings;
 class WebLayer;
 
+struct Referrer;
+
 class Frame : public RefCountedWillBeGarbageCollectedFinalized<Frame> {
 public:
     virtual bool isLocalFrame() const { return false; }
@@ -54,6 +58,7 @@ public:
     virtual ~Frame();
     virtual void trace(Visitor*);
 
+    virtual void navigate(Document& originDocument, const KURL&, const Referrer&, bool lockBackForwardList) = 0;
     virtual void detach() = 0;
     void detachChildren();