Support CancelCompositionText/ComfirmCompositionText in TSF

ui/base/ime/win/tsf_bridge.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_WIN_TSF_BRIDGE_H_
 #define UI_BASE_IME_WIN_TSF_BRIDGE_H_
 
 #include <Windows.h>
 #include <msctf.h>
 
@@ skipping 37 matching lines @@
 
   // Handles TextInputTypeChanged event. RWHVW is responsible for calling this
   // handler whenever renderer's input text type is changed. Does nothing
   // unless |client| is focused.
   virtual void OnTextInputTypeChanged(const TextInputClient* client) = 0;
 
   // Sends an event to TSF manager that the text layout should be updated.
   virtual void OnTextLayoutChanged() = 0;
 
   // Cancels the ongoing composition if exists.
+  // Returns true if there is no composition.
+  // Returns false if an edit session is on-going.
   // Returns false if an error occures.
   virtual bool CancelComposition() = 0;
 
+  // Confirms the ongoing composition if exists.
+  // Returns true if there is no composition.
+  // Returns false if an edit session is on-going.
+  // Returns false if an error occures.
+  virtual bool ConfirmComposition() = 0;
+
   // Sets currently focused TextInputClient.
   // Caller must free |client|.
   virtual void SetFocusedClient(HWND focused_window,
                                 TextInputClient* client) = 0;
 
   // Removes currently focused TextInputClient.
   // Caller must free |client|.
   virtual void RemoveFocusedClient(TextInputClient* client) = 0;
 
   // Obtains current thread manager.
   virtual base::win::ScopedComPtr<ITfThreadMgr> GetThreadManager() = 0;
 
   // Returns the focused text input client.
   virtual TextInputClient* GetFocusedTextInputClient() const = 0;
 
  protected:
   // Uses GetInstance() instead.
   TSFBridge();
 
  private:
   // Releases TLS instance.
   static void Finalize(void* data);
 
   DISALLOW_COPY_AND_ASSIGN(TSFBridge);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_WIN_TSF_BRIDGE_H_