Prepare for remote->local frame swap

public/web/WebLocalFrame.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebLocalFrame_h
 #define WebLocalFrame_h
 
 #include "WebFrame.h"
 
 namespace blink {
@@ skipping 14 matching lines @@
 
     // Returns the frame corresponding to the given context. This can return 0
     // if the context is detached from the frame, or if the context doesn't
     // correspond to a frame (e.g., workers).
     BLINK_EXPORT static WebLocalFrame* frameForContext(v8::Handle<v8::Context>);
 
     // Returns the frame inside a given frame or iframe element. Returns 0 if
     // the given element is not a frame, iframe or if the frame is empty.
     BLINK_EXPORT static WebLocalFrame* fromFrameOwnerElement(const WebElement&);
 
+    // Initialization ---------------------------------------------------------
+
+    // Used when we might swap from a remote frame to a local frame.
+    // Creates a provisional, semi-attached frame that will be fully
+    // swapped into the frame tree if it commits.
+    virtual void initializeToReplaceRemoteFrame(WebRemoteFrame*) = 0;
+
 
     // Navigation Ping --------------------------------------------------------
     virtual void sendPings(const WebNode& linkNode, const WebURL& destinationURL) = 0;
 
 
     // Navigation State -------------------------------------------------------
 
     // Returns true if the current frame's load event has not completed.
     virtual bool isLoading() const = 0;
 
@@ skipping 20 matching lines @@
     virtual v8::Handle<v8::Value> executeScriptAndReturnValueForTests(const WebScriptSource&) = 0;
 
     // Associates an isolated world with human-readable name which is useful for
     // extension debugging.
     virtual void setIsolatedWorldHumanReadableName(int worldID, const WebString&) = 0;
 };
 
 } // namespace blink
 
 #endif // WebLocalFrame_h