Implement virtual keyboard hiding.

ui/views/ime/input_method.h

 // Copyright (c) 2012 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 UI_VIEWS_IME_INPUT_METHOD_H_
 #define UI_VIEWS_IME_INPUT_METHOD_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 33 matching lines @@
   virtual ~InputMethod() {}
 
   // Sets the delegate used by this InputMethod instance.
   // This should only be called by the owner Widget or testing code.
   virtual void SetDelegate(internal::InputMethodDelegate* delegate) = 0;
 
   // Initialize the InputMethod object and attach it to the given |widget|.
   // The |widget| must already be initialized.
   virtual void Init(Widget* widget) = 0;
 
-  // Called when the top-level Widget gains or loses keyboard focus.
-  // These should only be called by the Widget that owns this InputMethod.
+  // Called when the top-level Widget gains, loses or possibly regains keyboard
+  // focus. These should only be called by the Widget that owns this
+  // InputMethod.
   virtual void OnFocus() = 0;
   virtual void OnBlur() = 0;
+  virtual void OnPossibleRefocus() = 0;
 
   // Called when the focused window receives native IME messages that are not
   // translated into other predefined event callbacks. Currently this method is
   // used only for IME functionalities specific to Windows.
   // TODO(ime): Break down these messages into platform-neutral methods.
   virtual bool OnUntranslatedIMEMessage(const base::NativeEvent& event,
                                         NativeEventResult* result) = 0;
 
   // Dispatch a key event to the input method. The key event will be dispatched
   // back to the caller via InputMethodDelegate::DispatchKeyEventPostIME(), once
@@ skipping 52 matching lines @@
 
   // Returns true if the input method is a mock instance used for testing.
   virtual bool IsMock() const = 0;
 
   // TODO(suzhe): Support mouse/touch event.
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_IME_INPUT_METHOD_H_