Use libcros to convert input method ID to keyboard overlay ID.

chrome/browser/chromeos/cros/input_method_library.h

 // Copyright (c) 2010 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 CHROME_BROWSER_CHROMEOS_CROS_INPUT_METHOD_LIBRARY_H_
 #define CHROME_BROWSER_CHROMEOS_CROS_INPUT_METHOD_LIBRARY_H_
 #pragma once
 
 #include <string>
 #include <utility>
@@ skipping 83 matching lines @@
   // the request and returns false.
   // You can specify |section| and |config_name| arguments in the same way
   // as GetImeConfig() above.
   // Notice: This function might call the Observer::ActiveInputMethodsChanged()
   // callback function immediately, before returning from the SetImeConfig
   // function. See also http://crosbug.com/5217.
   virtual bool SetImeConfig(const char* section,
                             const char* config_name,
                             const ImeConfigValue& value) = 0;
 
+  // Returns the keyboard overlay ID corresponding to |input_method_id|.
+  // Returns an empty string if there is no corresponding keyboard overlay ID.
+  virtual std::string GetKeyboardOverlayId(
+      const std::string& input_method_id) = 0;

[satorux1, 2011/01/05 03:42:29]

You can make it a const function as this function does not change any state.

[mazda, 2011/01/05 11:29:44]

Since EnsureLoadedAndStarted, which is used for the implementation, is
non-const, it is difficult to change this function to const function.
Do you have any ideas?

[satorux1, 2011/01/06 04:39:19]

Then, it's fine to be non-const. Sorry about the bad suggestion.

+
   // Sets the IME state to enabled, and launches its processes if needed.
   virtual void StartInputMethodProcesses() = 0;
 
   // Disables the IME, and kills the processes if they are running.
   virtual void StopInputMethodProcesses() = 0;
 
   // Controls whether the IME process is started when preload engines are
   // specificed, or defered until a non-default method is activated.
   virtual void SetDeferImeStartup(bool defer) = 0;
 
   // Controls whether the IME process is stopped when all non-default preload
   // engines are removed.
   virtual void SetEnableAutoImeShutdown(bool enable) = 0;
 
 
   virtual const InputMethodDescriptor& previous_input_method() const = 0;
   virtual const InputMethodDescriptor& current_input_method() const = 0;
 
   virtual const ImePropertyList& current_ime_properties() const = 0;
 
   // Factory function, creates a new instance and returns ownership.
   // For normal usage, access the singleton via CrosLibrary::Get().
   static InputMethodLibrary* GetImpl(bool stub);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CROS_INPUT_METHOD_LIBRARY_H_