Support InputMethodObserver in RemoteInputMethodWin

ui/base/ime/remote_input_method_win.h

 // Copyright 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_BASE_IME_REMOTE_INPUT_METHOD_WIN_H_
 #define UI_BASE_IME_REMOTE_INPUT_METHOD_WIN_H_
 
 #include <Windows.h>
 
 #include <string>
@@ skipping 15 matching lines @@
 // works as a proxy of an IME handler running in the metro_driver process.
 // RemoteInputMethodWin works as follows.
 // - Any action to RemoteInputMethodPrivateWin should be delegated to the
 //   metro_driver process via RemoteInputMethodDelegateWin.
 // - Data retrieval from RemoteInputMethodPrivateWin is implemented with
 //   data cache. Whenever the IME state in the metro_driver process is changed,
 //   RemoteRootWindowHostWin, which receives IPCs from metro_driver process,
 //   will call RemoteInputMethodPrivateWin::OnCandidatePopupChanged and/or
 //   RemoteInputMethodPrivateWin::OnInputSourceChanged accordingly so that
 //   the state cache should be updated.
-// Caveats: RemoteInputMethodWin does not support InputMethodObserver yet.
 
 // Returns the public interface of RemoteInputMethodWin.
 // Caveats: Currently only one instance of RemoteInputMethodWin is able to run
 // at the same time.
 UI_EXPORT scoped_ptr<InputMethod> CreateRemoteInputMethodWin(
     internal::InputMethodDelegate* delegate);
 
 // Private interface of RemoteInputMethodWin.
 class UI_EXPORT RemoteInputMethodPrivateWin {
  public:
@@ skipping 22 matching lines @@
   // values based on remote IME activities in the metro_driver process.
   virtual void OnInputSourceChanged(LANGID langid, bool is_ime) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RemoteInputMethodPrivateWin);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_REMOTE_INPUT_METHOD_WIN_H_