Browser should get notified if a views textfield changes focus. In addition,

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"
+#include "views/focus/focus_manager.h"
 
 class BrowserFrame;
 class BrowserView;
 class KeyboardContainerView;
 class NotificationDetails;
 class NotificationSource;
 
 class TouchBrowserFrameView : public OpaqueBrowserFrameView,
+                              public views::FocusChangeListener,
                               public TabStripModelObserver,
                               public NotificationObserver {
  public:
+  enum VirtualKeyboardType {
+    NONE,
+    GENERIC,
+    URL,
+  };
+
   // Constructs a non-client view for an BrowserFrame.
   TouchBrowserFrameView(BrowserFrame* frame, BrowserView* browser_view);
   virtual ~TouchBrowserFrameView();
 
   // Overridden from OpaqueBrowserFrameView
   virtual void Layout();
 
+  // views::FocusChangeListener implementation
+  virtual void FocusWillChange(views::View* focused_before,
+                               views::View* focused_now);
+
  protected:
   // Overridden from OpaqueBrowserFrameView
   virtual int GetReservedHeight() const;
+  virtual void ViewHierarchyChanged(bool is_add, View* parent, View* child);
 
  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_;
+  bool focus_listener_added_;
   KeyboardContainerView* keyboard_;
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchBrowserFrameView);
 };
 
 #endif  // CHROME_BROWSER_UI_TOUCH_FRAME_TOUCH_BROWSER_FRAME_VIEW_H_