Implement InputMethodTSF

ui/base/ime/input_method_tsf.h

Index: ui/base/ime/input_method_tsf.h
diff --git a/ui/base/ime/input_method_tsf.h b/ui/base/ime/input_method_tsf.h
index 8935f4440e5a6e55ad627a7f7c55a961e2caff65..4847c7481d3a927053e4d921037241839ec101b5 100644
--- a/ui/base/ime/input_method_tsf.h
+++ b/ui/base/ime/input_method_tsf.h
@@ -1,4 +1,4 @@
-// Copyright 2013 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -39,6 +39,10 @@ class UI_EXPORT InputMethodTSF : public InputMethodWin {
   // Asks the client to confirm current composition text.
   void ConfirmCompositionText();
 
+  // Returns true if the Win32 native window bound to |client| has Win32 input
+  // focus.
+  bool IsWindowFocused(const TextInputClient* client) const;
+
   DISALLOW_COPY_AND_ASSIGN(InputMethodTSF);
 };