Toggle spoken feedback if two fingers are held down.

chrome/browser/chromeos/accessibility/accessibility_manager.h

Index: chrome/browser/chromeos/accessibility/accessibility_manager.h
diff --git a/chrome/browser/chromeos/accessibility/accessibility_manager.h b/chrome/browser/chromeos/accessibility/accessibility_manager.h
index dda34505353b2c1d13574786248ab9a55d066c02..71be3897169e3b76327dd329cf01e4bab5a5ae24 100644
--- a/chrome/browser/chromeos/accessibility/accessibility_manager.h
+++ b/chrome/browser/chromeos/accessibility/accessibility_manager.h
@@ -249,6 +249,12 @@ class AccessibilityManager
   // Notify accessibility when locale changes occur.
   void OnLocaleChanged();
 
+  // While the user holds down two fingers on a touch screen, which is the
+  // gesture to enable spoken feedback (if held down long enough), play a sound
+  // every "tick" (approximately every half-second) to warn the user something
+  // is about to happen.
+  bool PlaySpokenFeedbackToggleCountdown(int tick_count);
+
   // Plays an earcon. Earcons are brief and distinctive sounds that indicate
   // when their mapped event has occurred. The sound key enums can be found in
   // chromeos/audio/chromeos_sounds.h.