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 fce3ef5874c5f93a72c35748c02a16bd8499ba37..36d49cc4680866f78b4ba5e5d1bf20d617ae44ea 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,
@@ -363,6 +366,8 @@ 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(
@@ -517,6 +522,13 @@ void Preferences::NotifyPrefChanged(const std::string* pref_name) {
     // preferencs, we don't need to send this to ibus-daemon.
   }
 
+  if (!pref_name || *pref_name == prefs::kLanguageSearchKeyActsAsFunctionKey) {
+    const bool right = search_key_acts_as_function_key_.GetValue();
+    PrefService* prefs = g_browser_process->local_state();

[Yusuke Sato, 2012/11/26 06:09:38]

For consistency, I'd prefer not to reflect the owner pref to local_state because
Alt/Ctrl/Search remapping is always disabled on login screen.

[danakj, 2012/11/26 17:20:16]

Oh I had trouble with the setting being loaded correctly, and was just
copy/pasting other code. I'll try just removing this piece and see what happens
again.

[danakj, 2012/11/26 19:36:26]

Done.

+    if (prefs->GetBoolean(prefs::kLanguageSearchKeyActsAsFunctionKey) != right)
+      prefs->SetBoolean(prefs::kLanguageSearchKeyActsAsFunctionKey, right);
+  }
+
   if (!pref_name || *pref_name == prefs::kLanguageXkbAutoRepeatEnabled) {
     const bool enabled = xkb_auto_repeat_enabled_.GetValue();
     input_method::XKeyboard::SetAutoRepeatEnabled(enabled);