Target touches to the correct display.

ui/events/gestures/gesture_recognizer.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_H_
 #define UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_H_
 
 #include <vector>
 
 #include "base/memory/scoped_vector.h"
@@ skipping 28 matching lines @@
 
   // Return the window which should handle this TouchEvent, in the case where
   // the touch is already associated with a target.
   // Otherwise, returns null.
   virtual GestureConsumer* GetTouchLockedTarget(const TouchEvent& event) = 0;
 
   // Return the window which should handle this GestureEvent.
   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.
   // The caller is responsible for updating the state of the consumers to
   // be aware of this transfer of control (there are no ENTERED/EXITED events).
   // If |new_consumer| is NULL, all events are canceled.
   // If |old_consumer| is NULL, all events not already targeting |new_consumer|
   // are canceled.
   virtual void TransferEventsTo(GestureConsumer* current_consumer,
                                 GestureConsumer* new_consumer) = 0;
@@ skipping 15 matching lines @@
 
   // Unsubscribes |helper| from async gesture dispatch.
   // Since the GestureRecognizer does not own the |helper|, it is not deleted
   // and must be cleaned up appropriately by the caller.
   virtual void RemoveGestureEventHelper(GestureEventHelper* helper) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_H_