Add power-user keyboard mode for ChromeOS with Search key acting as a typical Fn key.

chrome/browser/chromeos/preferences.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 CHROME_BROWSER_CHROMEOS_PREFERENCES_H_
 #define CHROME_BROWSER_CHROMEOS_PREFERENCES_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 123 matching lines @@
       language_prefs::kNumPinyinBooleanPrefs];
   IntegerPrefMember pinyin_int_prefs_[
       language_prefs::kNumPinyinIntegerPrefs];
   IntegerPrefMember pinyin_double_pinyin_schema_;
   BooleanPrefMember mozc_boolean_prefs_[
       language_prefs::kNumMozcBooleanPrefs];
   StringPrefMember mozc_multiple_choice_prefs_[
       language_prefs::kNumMozcMultipleChoicePrefs];
   IntegerPrefMember mozc_integer_prefs_[
       language_prefs::kNumMozcIntegerPrefs];
+  BooleanPrefMember search_key_acts_as_function_key_;
   BooleanPrefMember xkb_auto_repeat_enabled_;
   IntegerPrefMember xkb_auto_repeat_delay_pref_;
   IntegerPrefMember xkb_auto_repeat_interval_pref_;
 
   BooleanPrefMember enable_screen_lock_;
 
   BooleanPrefMember enable_drm_;
 
   DISALLOW_COPY_AND_ASSIGN(Preferences);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_PREFERENCES_H_