Prepare for Unified Gesture Recognizer landing in Aura

content/common/input/synthetic_web_input_event_builders.cc

 // Copyright 2013 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 "content/common/input/synthetic_web_input_event_builders.h"
 
 #include "base/logging.h"
 #include "content/common/input/web_touch_event_traits.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 
@@ skipping 129 matching lines @@
     float velocity_x,
     float velocity_y,
     WebGestureEvent::SourceDevice source_device) {
   WebGestureEvent result = Build(WebInputEvent::GestureFlingStart,
                                  source_device);
   result.data.flingStart.velocityX = velocity_x;
   result.data.flingStart.velocityY = velocity_y;
   return result;
 }
 
-SyntheticWebTouchEvent::SyntheticWebTouchEvent() : WebTouchEvent() {}
+SyntheticWebTouchEvent::SyntheticWebTouchEvent() : WebTouchEvent() {
+  SetTimestamp(base::TimeTicks::Now() - base::TimeTicks());
+}
 
 void SyntheticWebTouchEvent::ResetPoints() {
   int point = 0;
   for (unsigned int i = 0; i < touchesLength; ++i) {
     if (touches[i].state == WebTouchPoint::StateReleased)
       continue;
 
     touches[point] = touches[i];
     touches[point].state = WebTouchPoint::StateStationary;
     ++point;
@@ skipping 39 matching lines @@
   touches[index].state = WebTouchPoint::StateCancelled;
   WebTouchEventTraits::ResetType(
       WebInputEvent::TouchCancel, timeStampSeconds, this);
 }
 
 void SyntheticWebTouchEvent::SetTimestamp(base::TimeDelta timestamp) {
   timeStampSeconds = timestamp.InSecondsF();
 }
 
 }  // namespace content