Gestures are now possible using touch events with any ids

ui/aura/gestures/gesture_sequence.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_AURA_GESTURES_GESTURE_SEQUENCE_H_
 #define UI_AURA_GESTURES_GESTURE_SEQUENCE_H_
 #pragma once
 
 #include "base/timer.h"
 #include "ui/aura/gestures/gesture_point.h"
@@ skipping 37 matching lines @@
   virtual base::OneShotTimer<GestureSequence>* CreateTimer();
   base::OneShotTimer<GestureSequence>* long_press_timer() {
     return long_press_timer_.get();
   }
 
  private:
   void Reset();
 
   GesturePoint& GesturePointForEvent(const TouchEvent& event);
 
-  // Functions to be called to add GestureEvents, after succesful recognition.
+  // Do a linear scan through points_ to find the GesturePoint
+  // with id |point_id|.
+  GesturePoint* GetPointByPointId(int point_id);
+
+  // Functions to be called to add GestureEvents, after successful recognition.
 
   // Tap gestures.
   void AppendTapDownGestureEvent(const GesturePoint& point, Gestures* gestures);
   void AppendClickGestureEvent(const GesturePoint& point, Gestures* gestures);
   void AppendDoubleClickGestureEvent(const GesturePoint& point,
                                      Gestures* gestures);
   void AppendLongPressGestureEvent();
 
   // Scroll gestures.
   void AppendScrollGestureBegin(const GesturePoint& point,
@@ skipping 77 matching lines @@
 
   GesturePoint points_[kMaxGesturePoints];
   int point_count_;
 
   DISALLOW_COPY_AND_ASSIGN(GestureSequence);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_GESTURES_GESTURE_SEQUENCE_H_