Set the unique_event_id when converting from TouchEvent to WebTouchEvent

ui/events/gesture_detection/motion_event_buffer.cc

 // 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.
 
 #include "ui/events/gesture_detection/motion_event_buffer.h"
 
 #include "base/trace_event/trace_event.h"
 #include "ui/events/gesture_detection/motion_event_generic.h"
 
 namespace ui {
@@ skipping 128 matching lines @@
 
     if (event0_i == 0) {
       event.reset(new MotionEventGeneric(
           MotionEvent::ACTION_MOVE, resample_time, pointer));
     } else {
       event->PushPointer(pointer);
     }
   }
 
   DCHECK(event);
-  event->set_id(event0.GetId());
   event->set_button_state(event0.GetButtonState());
   return event.Pass();
 }
 
 // Synthesize a compound MotionEventGeneric event from a sequence of events.
 // Events must be in non-decreasing (time) order.
 scoped_ptr<MotionEventGeneric> ConsumeSamples(MotionEventVector events) {
   DCHECK(!events.empty());
   scoped_ptr<MotionEventGeneric> event(events.back());
   for (size_t i = 0; i + 1 < events.size(); ++i)
@@ skipping 172 matching lines @@
 
 void MotionEventBuffer::FlushWithoutResampling(MotionEventVector events) {
   last_extrapolated_event_time_ = base::TimeTicks();
   if (events.empty())
     return;
 
   client_->ForwardMotionEvent(*ConsumeSamples(events.Pass()));
 }
 
 }  // namespace ui