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

chrome/renderer/render_view.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_RENDERER_RENDER_VIEW_H_
 #define CHROME_RENDERER_RENDER_VIEW_H_
 #pragma once
 
 #include <deque>
 #include <map>
@@ skipping 292 matching lines @@
   void UnregisterPluginDelegate(WebPluginDelegateProxy* delegate);
 #endif
 
   // IPC::Channel::Listener implementation -------------------------------------
 
   virtual void OnMessageReceived(const IPC::Message& msg);
 
   // WebKit::WebWidgetClient implementation ------------------------------------
 
   // Most methods are handled by RenderWidget.
+  virtual void didFocus();
+  virtual void didBlur();
   virtual void show(WebKit::WebNavigationPolicy policy);
   virtual void closeWidgetSoon();
   virtual void runModal();
 
   // WebKit::WebViewClient implementation --------------------------------------
 
   virtual WebKit::WebView* createView(
       WebKit::WebFrame* creator,
       const WebKit::WebWindowFeatures& features,
       const WebKit::WebString& frame_name);
@@ skipping 985 matching lines @@
   // ADDING NEW DATA? Please see if it fits appropriately in one of the above
   // sections rather than throwing it randomly at the end. If you're adding a
   // bunch of stuff, you should probably create a helper class and put your
   // data and methods on that to avoid bloating RenderView more.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderView);
 };
 
 #endif  // CHROME_RENDERER_RENDER_VIEW_H_