Exposes more mutation functions to MotionEventGeneric

ui/events/gesture_detection/motion_event_generic.h

 // Copyright 2014 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_GESTURE_DETECTION_UI_MOTION_EVENT_GENERIC_H_
 #define UI_EVENTS_GESTURE_DETECTION_UI_MOTION_EVENT_GENERIC_H_
 
 #include "base/basictypes.h"
 #include "base/containers/stack_container.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 52 matching lines @@
   size_t GetHistorySize() const override;
   base::TimeTicks GetHistoricalEventTime(
       size_t historical_index) const override;
   float GetHistoricalTouchMajor(size_t pointer_index,
                                 size_t historical_index) const override;
   float GetHistoricalX(size_t pointer_index,
                        size_t historical_index) const override;
   float GetHistoricalY(size_t pointer_index,
                        size_t historical_index) const override;
 
-  void PushPointer(const PointerProperties& pointer);
+  // Adds |pointer| to the set of pointers returning the index it was added at.
+  size_t PushPointer(const PointerProperties& pointer);
+
+  // Removes the PointerProperties at |index|.
+  void RemovePointerAt(size_t index);
+
+  PointerProperties& pointer(size_t index) { return pointers_[index]; }
+  const PointerProperties& pointer(size_t index) const {
+    return pointers_[index];
+  }
 
   // Add an event to the history. |this| and |event| must have the same pointer
   // count and must both have an action of ACTION_MOVE.
   void PushHistoricalEvent(scoped_ptr<MotionEvent> event);
 
   void set_action(Action action) { action_ = action; }
   void set_event_time(base::TimeTicks event_time) { event_time_ = event_time; }
   void set_id(int id) { id_ = id; }
   void set_action_index(int action_index) { action_index_ = action_index; }
   void set_button_state(int button_state) { button_state_ = button_state; }
   void set_flags(int flags) { flags_ = flags; }
 
   static scoped_ptr<MotionEventGeneric> CloneEvent(const MotionEvent& event);
   static scoped_ptr<MotionEventGeneric> CancelEvent(const MotionEvent& event);
 
  protected:
   MotionEventGeneric();
   MotionEventGeneric(const MotionEvent& event, bool with_history);
   MotionEventGeneric& operator=(const MotionEventGeneric& other);
 
   void PopPointer();
 
-  PointerProperties& pointer(size_t index) { return pointers_[index]; }
-  const PointerProperties& pointer(size_t index) const {
-    return pointers_[index];
-  }
-
  private:
   enum { kTypicalMaxPointerCount = 5 };
 
   Action action_;
   base::TimeTicks event_time_;
   int id_;
   int action_index_;
   int button_state_;
   int flags_;
   base::StackVector<PointerProperties, kTypicalMaxPointerCount> pointers_;
   ScopedVector<MotionEvent> historical_events_;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_GESTURE_DETECTION_UI_MOTION_EVENT_GENERIC_H_