Add the actual location coordinates to the touch cancel event

ui/events/gestures/gesture_recognizer_impl.h

Index: ui/events/gestures/gesture_recognizer_impl.h
diff --git a/ui/events/gestures/gesture_recognizer_impl.h b/ui/events/gestures/gesture_recognizer_impl.h
index b2e8106498eb81a5446fd43d61c1ff506d0bbf5f..6e97b353b224027bdb1bc0f80c092c595f7a3dee 100644
--- a/ui/events/gestures/gesture_recognizer_impl.h
+++ b/ui/events/gestures/gesture_recognizer_impl.h
@@ -6,6 +6,7 @@
 #define UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_IMPL_H_
 
 #include <map>
+#include <set>
 #include <vector>
 
 #include "base/memory/linked_ptr.h"
@@ -94,6 +95,17 @@ class EVENTS_EXPORT GestureRecognizerImpl : public GestureRecognizer,
   // to a specific |consumer|.
   GestureEventHelper* FindDispatchHelperForConsumer(GestureConsumer* consumer);
 
+  // for all the GestureConsumers in the touches

[tdresser, 2014/08/13 19:57:58]

Capitalize comments, and end them with a period. 
I'm not sure you need these though (see comments in gesture_recognizer_impl.cc)

[lanwei, 2014/08/14 00:38:46]

Done.

+  // create a map from touch id to the touch location
+  std::map<int, gfx::PointF> GroupGestureConsumerWithTouchPoints(
+      std::vector<std::pair<int, GestureConsumer*> >* touches);
+
+  // create a map between the touch_id to the touch point location
+  // by iterating through the pointer_state in GestureConsumer's
+  // GestureProviderAura
+  std::map<int, gfx::PointF> MapTouchIDWithPointLocation(
+      GestureConsumer* consumer);
+
   std::map<GestureConsumer*, GestureSequence*> consumer_sequence_;
   std::map<GestureConsumer*, GestureProviderAura*> consumer_gesture_provider_;