Making window.focus()/blur() work only when there is a user gesture.

chrome/browser/tab_contents/tab_contents.h

 // Copyright (c) 2010 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 CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 #define CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 #pragma once
 
 #include "build/build_config.h"
 
@@ skipping 307 matching lines @@
   virtual void DidBecomeSelected();
 
   // Invoked when the tab contents becomes hidden.
   // NOTE: If you override this, call the superclass version too!
   virtual void WasHidden();
 
   // Activates this contents within its containing window, bringing that window
   // to the foreground if necessary.
   void Activate();
 
+  // Deactivates this contents by deactivating its containing window.
+  void Deactivate();
+
   // TODO(brettw) document these.
   virtual void ShowContents();
   virtual void HideContents();
 
 #ifdef UNIT_TEST
   // Expose the render manager for testing.
   RenderViewHostManager* render_manager() { return &render_manager_; }
 #endif
 
   // Commands ------------------------------------------------------------------
@@ skipping 917 matching lines @@
   bool displaying_pdf_content_;
 
   scoped_ptr<MatchPreview> match_preview_;
 
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(TabContents);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_