Make IME extensions decide when to show the keyboard.

ui/keyboard/keyboard_controller.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 UI_KEYBOARD_KEYBOARD_CONTROLLER_H_
 #define UI_KEYBOARD_KEYBOARD_CONTROLLER_H_
 
 #include <memory>
 
 #include "base/event_types.h"
@@ skipping 99 matching lines @@
   static void ResetInstance(KeyboardController* controller);
 
   // Retrieve the active keyboard controller.
   static KeyboardController* GetInstance();
 
   // Returns true if keyboard is currently visible.
   bool keyboard_visible() { return keyboard_visible_; }
 
   bool show_on_resize() { return show_on_resize_; }
 
+  // Returns true if keyboard window has been created.
+  bool IsKeyboardWindowCreated();
+
   // Returns the current keyboard bounds. An empty rectangle will get returned
   // when the keyboard is not shown or in FLOATING mode.
   const gfx::Rect& current_keyboard_bounds() {
     return current_keyboard_bounds_;
   }
 
  private:
   // For access to Observer methods for simulation.
   friend class KeyboardControllerTest;
 
@@ skipping 49 matching lines @@
   static KeyboardController* instance_;
 
   base::WeakPtrFactory<KeyboardController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyboardController);
 };
 
 }  // namespace keyboard
 
 #endif  // UI_KEYBOARD_KEYBOARD_CONTROLLER_H_