Don't refcount tracking id -> slot id mapping.

ui/events/event.h

Index: ui/events/event.h
diff --git a/ui/events/event.h b/ui/events/event.h
index e32e77c6700ca50b35a6224b07774cd763be9661..a0434a6fc3a70bd6f6a185ee8d3e4845d4522053 100644
--- a/ui/events/event.h
+++ b/ui/events/event.h
@@ -212,7 +212,7 @@ class EVENTS_EXPORT Event {
   void StopPropagation();
   bool stopped_propagation() const { return !!(result_ & ER_CONSUMED); }
 
-
+  // Marks the event as having been handled. A handled event does not reach the
   // next event phase. For example, if an event is handled during the pre-target
   // phase, then the event is dispatched to all pre-target handlers, but not to
   // the target or post-target handlers.
@@ -225,9 +225,6 @@ class EVENTS_EXPORT Event {
   Event(const base::NativeEvent& native_event, EventType type, int flags);
   Event(const Event& copy);
   void SetType(EventType type);
-  void set_delete_native_event(bool delete_native_event) {
-    delete_native_event_ = delete_native_event;
-  }
   void set_cancelable(bool cancelable) { cancelable_ = cancelable; }
 
   void set_time_stamp(const base::TimeDelta& time_stamp) {
@@ -495,7 +492,7 @@ class EVENTS_EXPORT TouchEvent : public LocatedEvent {
         radius_y_(model.radius_y_),
         rotation_angle_(model.rotation_angle_),
         force_(model.force_),
-        may_cause_scrolling_(model.may_cause_scrolling_) {}
+        should_remove_native_touch_id_mapping_(false) {}
 
   TouchEvent(EventType type,
              const gfx::PointF& location,
@@ -532,6 +529,12 @@ class EVENTS_EXPORT TouchEvent : public LocatedEvent {
   void set_radius_x(const float r) { radius_x_ = r; }
   void set_radius_y(const float r) { radius_y_ = r; }
 
+  void set_should_remove_native_touch_id_mapping(
+      bool should_remove_native_touch_id_mapping) {
+    should_remove_native_touch_id_mapping_ =
+        should_remove_native_touch_id_mapping;
+  }
+
   // Overridden from LocatedEvent.
   void UpdateForRootTransform(
       const gfx::Transform& inverted_root_transform) override;
@@ -570,6 +573,13 @@ class EVENTS_EXPORT TouchEvent : public LocatedEvent {
   // touchmove that exceeds the platform slop region, or a touchend that
   // causes a fling). Defaults to false.
   bool may_cause_scrolling_;
+
+  // True if this event should remove the mapping between the native
+  // event id and the chromium touch id. This should only be the case

[sadrul, 2015/01/26 18:49:46]

s/chromium touch id/touch_id_/

[tdresser, 2015/01/27 21:43:05]

Done.

+  // for release and cancel events where the associated touch press
+  // event created a mapping between the native id and the chromium
+  // touch id.
+  bool should_remove_native_touch_id_mapping_;
 };
 
 // An interface that individual platforms can use to store additional data on