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..28dbfff49702ee4027f507aaf5960b1db6b9b567 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;
@@ -544,7 +547,7 @@ class EVENTS_EXPORT TouchEvent : public LocatedEvent {
 
  private:
   // Adjusts rotation_angle_ to within the acceptable range.
-  void fixRotationAngle();
+  void FixRotationAngle();
 
   // The identity (typically finger) of the touch starting at 0 and incrementing
   // for each separable additional touch that the hardware can detect.
@@ -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 touch_id_. This should only be the case for
+  // release and cancel events where the associated touch press event
+  // created a mapping between the native id and the chromium touch
+  // id.

[sadrul, 2015/01/28 00:04:05]

s/chromium touch id/|touch_id_|/

[tdresser, 2015/01/28 14:52:14]

Done.

+  bool should_remove_native_touch_id_mapping_;
 };
 
 // An interface that individual platforms can use to store additional data on