Some improvement of validation message bubble UI.

chrome/renderer/validation_message_agent.h

 // Copyright (c) 2013 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_VALIDATION_MESSAGE_AGENT_H_
 #define CHROME_RENDERER_VALIDATION_MESSAGE_AGENT_H_
 
 #include "content/public/renderer/render_view_observer.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebValidationMessageClient.h"
 
 namespace content {
 class RenderView;
 }
 
 // An impelemntation of WebKit::WebValidationMessageClient. This dispatches
 // messages to the browser processes.
 class ValidationMessageAgent : public content::RenderViewObserver,
                                public WebKit::WebValidationMessageClient {
  public:
   explicit ValidationMessageAgent(content::RenderView* render_view);
   virtual ~ValidationMessageAgent();
 
  private:
   // WebValidationMessageClient functions:
-  virtual void showValidationMessage(const WebKit::WebRect& anchor_in_screen,
+  virtual void showValidationMessage(const WebKit::WebRect& anchor_in_root_view,
                                      const WebKit::WebString& main_text,
                                      const WebKit::WebString& sub_text,
                                      WebKit::WebTextDirection hint) OVERRIDE;
   virtual void hideValidationMessage() OVERRIDE;
+  virtual void moveValidationMessage(
+      const WebKit::WebRect& anchor_in_root_view);
 
   DISALLOW_COPY_AND_ASSIGN(ValidationMessageAgent);
 };
 
 #endif  // CHROME_RENDERER_VALIDATION_MESSAGE_AGENT_H_