[IME] Supports options page for each IME instead of single options page for each IME extension.

chrome/browser/chromeos/input_method/mock_input_method_manager.cc

 // 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.
 
 #include "chrome/browser/chromeos/input_method/mock_input_method_manager.h"
 
 namespace chromeos {
 namespace input_method {
 
 MockInputMethodManager::MockInputMethodManager()
@@ skipping 42 matching lines @@
 
 const std::vector<std::string>&
 MockInputMethodManager::GetActiveInputMethodIds() const {
   return active_input_method_ids_;
 }
 
 size_t MockInputMethodManager::GetNumActiveInputMethods() const {
   return 1;
 }
 
+const InputMethodDescriptor* MockInputMethodManager::GetInputMethodFromId(
+    const std::string& input_method_id) const {
+  static const InputMethodDescriptor defaultInputMethod =
+      InputMethodUtil::GetFallbackInputMethodDescriptor();
+  for (size_t i = 0; i < active_input_method_ids_.size(); i++) {
+    if (input_method_id == active_input_method_ids_[i]) {
+      return &defaultInputMethod;
+    }
+  }
+  return NULL;
+}
+
 void MockInputMethodManager::EnableLayouts(const std::string& language_code,
                                            const std::string& initial_layout) {
 }
 
 bool MockInputMethodManager::EnableInputMethods(
     const std::vector<std::string>& new_active_input_method_ids) {
   return true;
 }
 
 bool MockInputMethodManager::EnableInputMethod(
@@ skipping 87 matching lines @@
     const std::string& value) {
   delegate_.set_hardware_keyboard_layout(value);
 }
 
 bool MockInputMethodManager::IsLoginKeyboard(
     const std::string& layout) const {
   return true;
 }
 }  // namespace input_method
 }  // namespace chromeos