Add an option in language settings for activating the IME menu.

chrome/common/pref_names.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.
 
 // Constants for the names of various preferences, for easier changing.
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
 
 #include <stddef.h>
@@ skipping 172 matching lines @@
 // to remember and confusing. The prefs are actually for input methods and i18n
 // keyboards, not UI languages.
 extern const char kLanguageCurrentInputMethod[];
 extern const char kLanguagePreviousInputMethod[];
 extern const char kLanguagePreferredLanguages[];
 extern const char kLanguagePreferredLanguagesSyncable[];
 extern const char kLanguagePreloadEngines[];
 extern const char kLanguagePreloadEnginesSyncable[];
 extern const char kLanguageEnabledExtensionImes[];
 extern const char kLanguageEnabledExtensionImesSyncable[];
+extern const char kLangugaeActivateImeMenu[];
 extern const char kLanguageShouldMergeInputMethods[];
 extern const char kLanguageRemapCapsLockKeyTo[];
 extern const char kLanguageRemapSearchKeyTo[];
 extern const char kLanguageRemapControlKeyTo[];
 extern const char kLanguageRemapAltKeyTo[];
 extern const char kLanguageRemapDiamondKeyTo[];
 extern const char kLanguageSendFunctionKeys[];
 extern const char kLanguageXkbAutoRepeatEnabled[];
 extern const char kLanguageXkbAutoRepeatDelay[];
 extern const char kLanguageXkbAutoRepeatInterval[];
@@ skipping 585 matching lines @@
 
 extern const char kAllowDinosaurEasterEgg[];
 
 #if defined(OS_ANDROID)
 extern const char kClickedUpdateMenuItem[];
 #endif
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_