Two Finger Tap

ui/chromeos/touch_exploration_controller.h

Index: ui/chromeos/touch_exploration_controller.h
diff --git a/ui/chromeos/touch_exploration_controller.h b/ui/chromeos/touch_exploration_controller.h
index 59ff11444f54a4cf7bbd0b1a057e8de65ebfe23e..72286e1ce64638b002dbd2c98d046d1b8984f252 100644
--- a/ui/chromeos/touch_exploration_controller.h
+++ b/ui/chromeos/touch_exploration_controller.h
@@ -40,6 +40,9 @@ class TouchExplorationControllerDelegate {
   // Takes an int from 0.0 to 100.0 that indicates the percent the volume
   // should be set to.
   virtual void SetOutputLevel(int volume) = 0;
+
+  // Silences spoken feedback.
+  virtual void SilenceSpokenFeedback() = 0;
 };
 
 // TouchExplorationController is used in tandem with "Spoken Feedback" to
@@ -183,6 +186,8 @@ class UI_CHROMEOS_EXPORT TouchExplorationController
       const ui::TouchEvent& event, scoped_ptr<ui::Event>* rewritten_event);
   ui::EventRewriteStatus InSlideGesture(
       const ui::TouchEvent& event, scoped_ptr<ui::Event>* rewritten_event);
+  ui::EventRewriteStatus InTwoFingerTap(
+      const ui::TouchEvent& event, scoped_ptr<ui::Event>* rewritten_event);
 
   // Returns the current time of the tick clock.
   base::TimeDelta Now();
@@ -314,6 +319,9 @@ class UI_CHROMEOS_EXPORT TouchExplorationController
     // including corners, then the resulting movements will be interpreted as
     // slide gestures.
     SLIDE_GESTURE,
+
+    // If the user makes a two finger tap, silence spoken feedback.
+    TWO_FINGER_TAP,
   };
 
   enum ScreenLocation {