Target touches to the correct display.

ui/events/gestures/gesture_recognizer.h

Index: ui/events/gestures/gesture_recognizer.h
diff --git a/ui/events/gestures/gesture_recognizer.h b/ui/events/gestures/gesture_recognizer.h
index 92d225a71187276ff2c92d72595b7ea335609dd7..457f66e193598efd0a0b28d46d3cf67acda39172 100644
--- a/ui/events/gestures/gesture_recognizer.h
+++ b/ui/events/gestures/gesture_recognizer.h
@@ -46,10 +46,12 @@ class EVENTS_EXPORT GestureRecognizer {
   virtual GestureConsumer* GetTargetForGestureEvent(
       const GestureEvent& event) = 0;
 
-  // If there is an active touch within
-  // GestureConfiguration::max_separation_for_gesture_touches_in_pixels,
-  // of |location|, returns the target of the nearest active touch.
-  virtual GestureConsumer* GetTargetForLocation(const gfx::Point& location) = 0;
+  // Returns the target of the nearest active touch with source device of
+  // |source_device_id|, within
+  // GestureConfiguration::max_separation_for_gesture_touches_in_pixels of
+  // |location|, or NULL if no such point exists.
+  virtual GestureConsumer* GetTargetForLocation(
+      const gfx::Point& location, int source_device_id) = 0;
 
   // Makes |new_consumer| the target for events previously targeting
   // |current_consumer|. All other targets are canceled.