keyboard: Update the visibility after tab-switch.

chrome/browser/ui/touch/frame/touch_browser_frame_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_BROWSER_UI_TOUCH_FRAME_TOUCH_BROWSER_FRAME_VIEW_H_
 #define CHROME_BROWSER_UI_TOUCH_FRAME_TOUCH_BROWSER_FRAME_VIEW_H_
 #pragma once
 
 #include "chrome/browser/ui/views/frame/opaque_browser_frame_view.h"
+#include "chrome/browser/tabs/tab_strip_model_observer.h"
 #include "chrome/common/notification_observer.h"
 #include "chrome/common/notification_registrar.h"
 
 class BrowserFrame;
 class BrowserView;
 class KeyboardContainerView;
 class NotificationDetails;
 class NotificationSource;
 
 class TouchBrowserFrameView : public OpaqueBrowserFrameView,
+                              public TabStripModelObserver,
                               public NotificationObserver {
  public:
   // Constructs a non-client view for an BrowserFrame.
   TouchBrowserFrameView(BrowserFrame* frame, BrowserView* browser_view);
   virtual ~TouchBrowserFrameView();
 
   // Overridden from OpaqueBrowserFrameView
   virtual void Layout();
 
  protected:
   // Overridden from OpaqueBrowserFrameView
   virtual int GetReservedHeight() const;
 
  private:
   virtual void InitVirtualKeyboard();
   virtual void UpdateKeyboardAndLayout(bool should_show_keyboard);
 
+  // Overrridden from TabStripModelObserver.
+  virtual void TabSelectedAt(TabContentsWrapper* old_contents,
+                             TabContentsWrapper* new_contents,
+                             int index,
+                             bool user_gesture);
+
   // Overridden from NotificationObserver.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
   bool keyboard_showing_;
   KeyboardContainerView* keyboard_;
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchBrowserFrameView);
 };
 
 #endif  // CHROME_BROWSER_UI_TOUCH_FRAME_TOUCH_BROWSER_FRAME_VIEW_H_