Lazy initialization for ExtensionInputMethodEventRouter

chrome/browser/chromeos/extensions/input_method_event_router.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 "input_method_event_router.h"
 
 #include <algorithm>
 
 #include "base/json/json_writer.h"
 #include "base/values.h"
+#include "chrome/browser/chromeos/extensions/input_method_api.h"
 #include "chrome/browser/chromeos/input_method/input_method_configuration.h"
 #include "chrome/browser/chromeos/web_socket_proxy_controller.h"
 #include "chrome/browser/extensions/event_names.h"
 #include "chrome/browser/extensions/event_router.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/profiles/profile.h"
 
-namespace {
-
-// Prefix, which is used by XKB.
-const char kXkbPrefix[] = "xkb:";
-
-}  // namespace
-
 namespace chromeos {
 
 ExtensionInputMethodEventRouter::ExtensionInputMethodEventRouter() {
   input_method::GetInputMethodManager()->AddObserver(this);
 }
 
 ExtensionInputMethodEventRouter::~ExtensionInputMethodEventRouter() {
   input_method::GetInputMethodManager()->RemoveObserver(this);
 }
 
 void ExtensionInputMethodEventRouter::InputMethodChanged(
     input_method::InputMethodManager *manager,
     bool show_message) {
   Profile *profile = ProfileManager::GetDefaultProfile();
   extensions::EventRouter *router =
       extensions::ExtensionSystem::Get(profile)->event_router();
 
   if (!router->HasEventListener(extensions::event_names::kOnInputMethodChanged))
     return;
 
   scoped_ptr<ListValue> args(new ListValue());
   StringValue *input_method_name = new StringValue(
-      GetInputMethodForXkb(manager->GetCurrentInputMethod().id()));
+      extensions::InputMethodAPI::GetInputMethodForXkb(
+          manager->GetCurrentInputMethod().id()));
   args->Append(input_method_name);
 
   // The router will only send the event to extensions that are listening.
   scoped_ptr<extensions::Event> event(new extensions::Event(
       extensions::event_names::kOnInputMethodChanged, args.Pass()));
   event->restrict_to_profile = profile;
   extensions::ExtensionSystem::Get(profile)->event_router()->
       BroadcastEvent(event.Pass());
 }
 
-std::string ExtensionInputMethodEventRouter::GetInputMethodForXkb(
-    const std::string& xkb_id) {
-  size_t prefix_length = std::string(kXkbPrefix).length();
-  DCHECK(xkb_id.substr(0, prefix_length) == kXkbPrefix);
-  return xkb_id.substr(prefix_length);
-}
-
 }  // namespace chromeos