Support SetFocusedTextInputClient(NULL) in InputMethodTSF

ui/base/ime/input_method_tsf.cc

 // 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.
 
 #include "ui/base/ime/input_method_tsf.h"
 
 #include "ui/base/ime/text_input_client.h"
 #include "ui/base/ime/win/tsf_bridge.h"
 
 namespace ui {
@@ skipping 71 matching lines @@
 
 void InputMethodTSF::CancelComposition(const TextInputClient* client) {
   if (IsTextInputClientFocused(client) && IsWindowFocused(client))
     ui::TSFBridge::GetInstance()->CancelComposition();
 }
 
 void InputMethodTSF::SetFocusedTextInputClient(TextInputClient* client) {
   if (IsWindowFocused(client)) {
     ui::TSFBridge::GetInstance()->SetFocusedClient(
         GetAttachedWindowHandle(client), client);
+  } else if (!client) {
+    // SetFocusedTextInputClient(NULL) must be interpreted as
+    // "Remove the attached client whichever client is attached".
+    TextInputClient* focused_client =
+        ui::TSFBridge::GetInstance()->GetFocusedTextInputClient();
+    ui::TSFBridge::GetInstance()->RemoveFocusedClient(focused_client);

[Seigo Nonaka, 2013/06/21 12:12:38]

can be follows?
ui::TSFBridge::GetInstance()->RemoveFocusedClient(
     ui::TSFBridge::GetInstance()->GetFocusedTextInputClient());

[Yohei Yukawa, 2013/06/22 10:46:40]

Done.

   }
   InputMethodWin::SetFocusedTextInputClient(client);
 }
 
 void InputMethodTSF::OnWillChangeFocusedClient(TextInputClient* focused_before,
                                                TextInputClient* focused) {
   if (IsWindowFocused(focused_before)) {
     ConfirmCompositionText();
     ui::TSFBridge::GetInstance()->RemoveFocusedClient(focused_before);
   }
@@ skipping 25 matching lines @@
 }
 
 bool InputMethodTSF::IsWindowFocused(const TextInputClient* client) const {
   if (!client)
     return false;
   HWND attached_window_handle = GetAttachedWindowHandle(client);
   return attached_window_handle && GetFocus() == attached_window_handle;
 }
 
 }  // namespace ui