Introduce IsMemberOfExtension function into ExtensionIMEUtil.

chromeos/ime/extension_ime_util.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 CHROMEOS_IME_EXTENSION_IME_UTIL_H_
 #define CHROMEOS_IME_EXTENSION_IME_UTIL_H_
 
 #include <string>
 
 #include "chromeos/chromeos_export.h"
 
 namespace chromeos {
 
 // Extension IME related utilities.
 namespace extension_ime_util {
 
 // Returns InputMethodID for |engine_id| in |extension_id|.
 std::string CHROMEOS_EXPORT GetInputMethodID(const std::string& extension_id,
                                              const std::string& engine_id);
 
 // Returns true if the |input_method_id| is extension ime.
 bool CHROMEOS_EXPORT IsExtensionIME(const std::string& input_method_id);
 
+// Returns true if the |input_method| is member of |extension_id|, otherwise
+// return false.
+bool CHROMEOS_EXPORT IsMemberOfExtension(const std::string& input_method_id,
+                                         const std::string& extension_id);
+
 }  // extension_ime_util
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_IME_EXTENSION_IME_UTIL_H_