Refactor the Android port to allow access to the chrome layer.

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 289 matching lines @@
   // typically happens when popups are created.
   virtual void WebContentsCreated(WebContents* source_contents,
                                   int64 source_frame_id,
                                   const GURL& target_url,
                                   WebContents* new_contents) {}
 
   // Notifies the delegate that the content restrictions for this tab has
   // changed.
   virtual void ContentRestrictionsChanged(WebContents* source) {}
 
+#if defined(OS_ANDROID)
+  // Returns true if the delegate wants to handle the url instead. Default
+  // returns false.
+  virtual bool ShouldOverrideLoading(const GURL& url);
+#endif
+
   // Notification that the tab is hung.
   virtual void RendererUnresponsive(WebContents* source) {}
 
   // Notification that the tab is no longer hung.
   virtual void RendererResponsive(WebContents* source) {}
 
   // Notification that a worker associated with this tab has crashed.
   virtual void WorkerCrashed(WebContents* source) {}
 
   // Invoked when a main fram navigation occurs.
@@ skipping 114 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_