Fix pushState causing stop/reload button and favicon to flicker.

content/public/browser/web_contents_delegate.h

 // Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 94 matching lines @@
   // Selects the specified contents, bringing its container to the front.
   virtual void ActivateContents(WebContents* contents) {}
 
   // Deactivates the specified contents by deactivating its container and
   // potentialy moving it to the back of the Z order.
   virtual void DeactivateContents(WebContents* contents) {}
 
   // Notifies the delegate that this contents is starting or is done loading
   // some resource. The delegate should use this notification to represent
   // loading feedback. See WebContents::IsLoading()
-  virtual void LoadingStateChanged(WebContents* source) {}
+  // |to_different_document| will be true unless the load is a fragment
+  // navigation, or triggered by history.pushState/replaceState.
+  virtual void LoadingStateChanged(WebContents* source,
+                                   bool to_different_document) {}
 
   // Notifies the delegate that the page has made some progress loading.
   // |progress| is a value between 0.0 (nothing loaded) to 1.0 (page fully
   // loaded).
   virtual void LoadProgressChanged(WebContents* source,
                                    double progress) {}
 
   // Request the delegate to close this web contents, and do whatever cleanup
   // it needs to do.
   virtual void CloseContents(WebContents* source) {}
@@ skipping 344 matching lines @@
   // Called when |this| is no longer the WebContentsDelegate for |source|.
   void Detach(WebContents* source);
 
   // The WebContents that this is currently a delegate for.
   std::set<WebContents*> attached_contents_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_DELEGATE_H_