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

chrome/browser/chromeos/login/web_page_screen.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_CHROMEOS_LOGIN_WEB_PAGE_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_WEB_PAGE_SCREEN_H_
 #pragma once
 
 #include "base/timer.h"
 #include "chrome/browser/chromeos/login/screen_observer.h"
@@ skipping 19 matching lines @@
                               WindowOpenDisposition disposition,
                               PageTransition::Type transition) {}
   virtual void NavigationStateChanged(const TabContents* source,
                                       unsigned changed_flags) = 0;
   virtual void AddNewContents(TabContents* source,
                               TabContents* new_contents,
                               WindowOpenDisposition disposition,
                               const gfx::Rect& initial_pos,
                               bool user_gesture) {}
   virtual void ActivateContents(TabContents* contents) {}
+  virtual void DeactivateContents(TabContents* contents) {}
   virtual void LoadingStateChanged(TabContents* source) = 0;
   virtual void CloseContents(TabContents* source) {}
   virtual bool IsPopup(TabContents* source) { return false; }
   virtual void URLStarredChanged(TabContents* source, bool starred) {}
   virtual void UpdateTargetURL(TabContents* source, const GURL& url) {}
   virtual bool ShouldAddNavigationToHistory() const { return false; }
   virtual void MoveContents(TabContents* source, const gfx::Rect& pos) {}
   virtual void ToolbarSizeChanged(TabContents* source, bool is_animating) {}
   virtual bool HandleContextMenu(const ContextMenuParams& params);
 
   // Called by |timeout_timer_|. Stops page fetching and closes screen.
   void OnNetworkTimeout();
 
   // Start/stop timeout timer.
   void StartTimeoutTimer();
   void StopTimeoutTimer();
 
  private:
   // Timer used for network response timeout.
   base::OneShotTimer<WebPageScreen> timeout_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(WebPageScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WEB_PAGE_SCREEN_H_