A11y: Add the option to always show the a11y tray menu regardless of the state of a11y features

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 78a1660658030e89a544de8f3988d8595af40507..441ff7a2fb26ea67d3ba449de0b9336a08693caf 100644
--- a/chrome/browser/chromeos/preferences.cc
+++ b/chrome/browser/chromeos/preferences.cc
@@ -112,6 +112,12 @@ void Preferences::RegisterUserPrefs(PrefService* prefs) {
   if (prefs->FindPreference(prefs::kMagnifierType) == NULL) {
     prefs->RegisterStringPref(prefs::kMagnifierType,
                               "",
+                              PrefService::SYNCABLE_PREF);
+  }
+  if (prefs->FindPreference(prefs::kShouldAlwaysShowAccessibilityMenu) ==
+      NULL) {
+    prefs->RegisterBooleanPref(prefs::kShouldAlwaysShowAccessibilityMenu,
+                              "",
                               PrefService::UNSYNCABLE_PREF);
   }
   if (prefs->FindPreference(prefs::kVirtualKeyboardEnabled) == NULL) {