Make DispatchKeyEventPostIME() asynchronous.

ui/base/ime/input_method_base.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_BASE_H_
 #define UI_BASE_IME_INPUT_METHOD_BASE_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 93 matching lines @@
   // |client| which is the text input client with focus.
   void NotifyTextInputCaretBoundsChanged(const TextInputClient* client);
 
   // Gets the bounds of the composition text or cursor in |client|.
   std::vector<gfx::Rect> GetCompositionBounds(const TextInputClient* client);
 
   // Indicates whether the IME extension is currently sending a fake key event.
   // This is used in SendKeyEvent.
   bool sending_key_event_;
 
+  internal::InputMethodDelegate* delegate_;
+
  private:
   // InputMethod:
   const std::vector<std::unique_ptr<ui::KeyEvent>>& GetKeyEventsForTesting()
       override;
 
   void SetFocusedTextInputClientInternal(TextInputClient* client);
 
-  internal::InputMethodDelegate* delegate_;
   TextInputClient* text_input_client_;
 
   base::ObserverList<InputMethodObserver> observer_list_;
 
   std::vector<std::unique_ptr<ui::KeyEvent>> key_events_for_testing_;
 
   // Screen bounds of a on-screen keyboard.
   gfx::Rect keyboard_bounds_;
 
   DISALLOW_COPY_AND_ASSIGN(InputMethodBase);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_INPUT_METHOD_BASE_H_