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

ui/events/event.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_EVENT_H_
 #define UI_EVENTS_EVENT_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/event_types.h"
@@ skipping 194 matching lines @@
   // Returns true if the event has a valid |native_event_|.
   bool HasNativeEvent() const;
 
   // Immediately stops the propagation of the event. This must be called only
   // from an EventHandler during an event-dispatch. Any event handler that may
   // be in the list will not receive the event after this is called.
   // Note that StopPropagation() can be called only for cancelable events.
   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.
   // Note that SetHandled() can be called only for cancelable events.
   void SetHandled();
   bool handled() const { return result_ != ER_UNHANDLED; }
 
  protected:
   Event(EventType type, base::TimeDelta time_stamp, int flags);
   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) {
     time_stamp_ = time_stamp;
   }
 
   void set_name(const std::string& name) { name_ = name; }
 
  private:
   friend class EventTestApi;
@@ skipping 247 matching lines @@
   // converted from |source| coordinate system to |target| coordinate system.
   template <class T>
   TouchEvent(const TouchEvent& model, T* source, T* target)
       : LocatedEvent(model, source, target),
         touch_id_(model.touch_id_),
         unique_event_id_(model.unique_event_id_),
         radius_x_(model.radius_x_),
         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) {}

[jdduke (slow), 2015/02/03 00:24:57]

Looks like a bad rebase. |may_cause_scrolling_| is no longer initialized,
neither here nor in the other constructors.

 
   TouchEvent(EventType type,
              const gfx::PointF& location,
              int touch_id,
              base::TimeDelta time_stamp);
 
   TouchEvent(EventType type,
              const gfx::PointF& location,
              int flags,
              int touch_id,
@@ skipping 16 matching lines @@
   float rotation_angle() const { return rotation_angle_; }
   float force() const { return force_; }
 
   void set_may_cause_scrolling(bool causes) { may_cause_scrolling_ = causes; }
   bool may_cause_scrolling() const { return may_cause_scrolling_; }
 
   // Used for unit tests.
   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;
 
   // Marks the event as not participating in synchronous gesture recognition.
   void DisableSynchronousHandling();
   bool synchronous_handling_disabled() const {
     return !!(result() & ER_DISABLE_SYNC_HANDLING);
   }
 
  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.
   const int touch_id_;
 
   // A unique identifier for the touch event.
   const uint64 unique_event_id_;
 
   // Radius of the X (major) axis of the touch ellipse. 0.0 if unknown.
   float radius_x_;
 
   // Radius of the Y (minor) axis of the touch ellipse. 0.0 if unknown.
   float radius_y_;
 
   // Clockwise angle (in degrees) of the major axis from the X axis. Must be
   // less than 180 and non-negative.
   float rotation_angle_;
 
   // Force (pressure) of the touch. Normalized to be [0, 1]. Default to be 0.0.
   float force_;
 
   // Whether the (unhandled) touch event will produce a scroll event (e.g., a
   // 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 touch_id_.
+  bool should_remove_native_touch_id_mapping_;
 };
 
 // An interface that individual platforms can use to store additional data on
 // KeyEvent.
 //
 // Currently only used in mojo.
 class EVENTS_EXPORT ExtendedKeyEventData {
  public:
   virtual ~ExtendedKeyEventData() {}
 
@@ skipping 282 matching lines @@
 
   const GestureEventDetails& details() const { return details_; }
 
  private:
   GestureEventDetails details_;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_EVENT_H_