GuestView: Double clicking a GuestView type in task manager should activate the embedder.

extensions/browser/guest_view/guest_view_base.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 EXTENSIONS_BROWSER_GUEST_VIEW_GUEST_VIEW_BASE_H_
 #define EXTENSIONS_BROWSER_GUEST_VIEW_GUEST_VIEW_BASE_H_
 
 #include <queue>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 255 matching lines @@
 
   static void RegisterGuestViewTypes();
 
   // WebContentsObserver implementation.
   virtual void DidStopLoading(
       content::RenderViewHost* render_view_host) OVERRIDE FINAL;
   virtual void RenderViewReady() OVERRIDE FINAL;
   virtual void WebContentsDestroyed() OVERRIDE FINAL;
 
   // WebContentsDelegate implementation.
+  virtual void ActivateContents(content::WebContents* contents) OVERRIDE FINAL;
+  virtual void DeactivateContents(
+      content::WebContents* contents) OVERRIDE FINAL;
   virtual void RunFileChooser(
       content::WebContents* web_contents,
       const content::FileChooserParams& params) OVERRIDE;
   virtual bool ShouldFocusPageAfterCrash() OVERRIDE FINAL;
   virtual bool PreHandleGestureEvent(
       content::WebContents* source,
       const blink::WebGestureEvent& event) OVERRIDE FINAL;
 
   content::WebContents* embedder_web_contents_;
   std::string embedder_extension_id_;
@@ skipping 44 matching lines @@
   // This is used to ensure pending tasks will not fire after this object is
   // destroyed.
   base::WeakPtrFactory<GuestViewBase> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GuestViewBase);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_GUEST_VIEW_GUEST_VIEW_BASE_H_