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

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index 9b8d6b591ffe31ab3e8e0e5d42bc9f682c1e6b1a..5b232fac71dd32f4a218e1040a7a38897ab4b641 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -741,6 +741,9 @@ const char kMagnifierType[] = "settings.a11y.screen_magnifier_type";
 // A boolean pref which determines whether virtual keyboard is enabled.
 // TODO(hashimoto): Remove this pref.
 const char kVirtualKeyboardEnabled[] = "settings.a11y.virtual_keyboard";
+// A boolean pref which determines whether the accessibility menu shows
+// regardless of the state of a11y features.
+const char kShouldAlwaysShowAccessibilityMenu[] = "settings.a11y.enable_menu";
 
 // A boolean pref which turns on Advanced Filesystem
 // (USB support, SD card, etc).