Add timestamps to synthesized events.

content/browser/renderer_host/input/synthetic_gesture_controller.cc

Index: content/browser/renderer_host/input/synthetic_gesture_controller.cc
diff --git a/content/browser/renderer_host/input/synthetic_gesture_controller.cc b/content/browser/renderer_host/input/synthetic_gesture_controller.cc
index 0529354ac38237b56a006f17d5e226a62ed850ca..fe399878636cc63a6a229bd2bdaa3da7e611de70 100644
--- a/content/browser/renderer_host/input/synthetic_gesture_controller.cc
+++ b/content/browser/renderer_host/input/synthetic_gesture_controller.cc
@@ -33,16 +33,8 @@ void SyntheticGestureController::Flush(base::TimeTicks timestamp) {
   if (pending_gesture_queue_.empty())
     return;
 
-  if (last_tick_time_.is_null()) {
-    last_tick_time_ = timestamp;
-    gesture_target_->SetNeedsFlush();
-    return;
-  }
-
-  base::TimeDelta interval = timestamp - last_tick_time_;
-  last_tick_time_ = timestamp;
   SyntheticGesture::Result result =
-      pending_gesture_queue_.front()->ForwardInputEvents(interval,
+      pending_gesture_queue_.front()->ForwardInputEvents(timestamp,
                                                          gesture_target_.get());
 
   if (result == SyntheticGesture::GESTURE_RUNNING) {
@@ -53,13 +45,8 @@ void SyntheticGestureController::Flush(base::TimeTicks timestamp) {
   StopGesture(*pending_gesture_queue_.front(), result);
   pending_gesture_queue_.erase(pending_gesture_queue_.begin());
 
-  if (!pending_gesture_queue_.empty()) {
+  if (!pending_gesture_queue_.empty())
     StartGesture(*pending_gesture_queue_.front());
-  } else {
-    // Reset last_tick_time_ so that we don't use an old value when a new
-    // gestures is queued.
-    last_tick_time_ = base::TimeTicks();
-  }
 }
 
 void SyntheticGestureController::StartGesture(const SyntheticGesture& gesture) {