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

chrome/browser/chromeos/preferences.cc

Index: chrome/browser/chromeos/preferences.cc
diff --git a/chrome/browser/chromeos/preferences.cc b/chrome/browser/chromeos/preferences.cc
index 5909d1448702eca2ff19ec965d22a8bf1ff5023f..1ec7a400ef8e880e83040c2ccf95d4022acab53a 100644
--- a/chrome/browser/chromeos/preferences.cc
+++ b/chrome/browser/chromeos/preferences.cc
@@ -233,6 +233,9 @@ void Preferences::RegisterUserPrefs(PrefService* prefs) {
   prefs->RegisterIntegerPref(prefs::kLanguageRemapCapsLockKeyTo,
                              input_method::kCapsLockKey,
                              PrefService::SYNCABLE_PREF);
+  prefs->RegisterBooleanPref(prefs::kLanguageSearchKeyActsAsFunctionKey,
+                             false,
+                             PrefService::SYNCABLE_PREF);
   // We don't sync the following keyboard prefs since they are not user-
   // configurable.
   prefs->RegisterBooleanPref(prefs::kLanguageXkbAutoRepeatEnabled,
@@ -365,6 +368,8 @@ void Preferences::InitUserPrefs(PrefService* prefs) {
     mozc_integer_prefs_[i].Init(
         language_prefs::kMozcIntegerPrefs[i].pref_name, prefs, callback);
   }
+  search_key_acts_as_function_key_.Init(
+      prefs::kLanguageSearchKeyActsAsFunctionKey, prefs, callback);
   xkb_auto_repeat_enabled_.Init(
       prefs::kLanguageXkbAutoRepeatEnabled, prefs, callback);
   xkb_auto_repeat_delay_pref_.Init(