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

chromeos/ime/input_method_manager.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 CHROMEOS_IME_INPUT_METHOD_MANAGER_H_
 #define CHROMEOS_IME_INPUT_METHOD_MANAGER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 87 matching lines @@
 
   // Returns the list of input methods we can select (i.e. active) including
   // extension input methods.
   // The same as GetActiveInputMethods but returns reference to internal list.
   virtual const std::vector<std::string>& GetActiveInputMethodIds() const = 0;
 
   // Returns the number of active input methods including extension input
   // methods.
   virtual size_t GetNumActiveInputMethods() const = 0;
 
+  // Returns the input method descriptor from the given input method id string.
+  // If the given input method id is invalid, returns NULL.
+  virtual const InputMethodDescriptor* GetInputMethodFromId(
+      const std::string& input_method_id) const = 0;
+
   // Changes the current input method to |input_method_id|. If |input_method_id|
   // is not active, switch to the first one in the active input method list.
   virtual void ChangeInputMethod(const std::string& input_method_id) = 0;
 
   // Enables keyboard layouts (e.g. US Qwerty, US Dvorak, French Azerty) that
   // are necessary for the |language_code| and then switches to |initial_layout|
   // if the string is not empty. For example, if |language_code| is "en-US", US
   // Qwerty, US International, US Extended, US Dvorak, and US Colemak layouts
   // would be enabled. Likewise, for Germany locale, US Qwerty which corresponds
   // to the hardware keyboard layout and several keyboard layouts for Germany
@@ skipping 65 matching lines @@
   virtual bool SwitchInputMethod(const ui::Accelerator& accelerator) = 0;
 
   // If keyboard layout can be uset at login screen
   virtual bool IsLoginKeyboard(const std::string& layout) const = 0;
 };
 
 }  // namespace input_method
 }  // namespace chromeos
 
 #endif  // CHROMEOS_IME_INPUT_METHOD_MANAGER_H_