Implement virtual keyboard hiding.

ui/base/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_BASE_IME_INPUT_METHOD_H_
 #define UI_BASE_IME_INPUT_METHOD_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 53 matching lines @@
   // Initializes the InputMethod object. Pass true if the system toplevel window
   // already has keyboard focus.
   virtual void Init(bool focused) = 0;
 
   // Called when the top-level system window gets keyboard focus.
   virtual void OnFocus() = 0;
 
   // Called when the top-level system window loses keyboard focus.
   virtual void OnBlur() = 0;
 
+  // Called when the top-level system window may have re-received keyboard
+  // focused.
+  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;
 
   // Sets the text input client which receives text input events such as
   // SetCompositionText(). |client| can be NULL. A gfx::NativeWindow which
   // implementes TextInputClient interface, e.g. NWA and RWHVA, should register
@@ skipping 69 matching lines @@
   virtual bool IsCandidatePopupOpen() const = 0;
 
   // Management of the observer list.
   virtual void AddObserver(InputMethodObserver* observer) = 0;
   virtual void RemoveObserver(InputMethodObserver* observer) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_INPUT_METHOD_H_