Set the unique_event_id when converting from TouchEvent to WebTouchEvent

ui/events/gestures/gesture_recognizer_impl.cc

Index: ui/events/gestures/gesture_recognizer_impl.cc
diff --git a/ui/events/gestures/gesture_recognizer_impl.cc b/ui/events/gestures/gesture_recognizer_impl.cc
index 774350353309cf1ddb1d63a94ce3c6dee94433f3..4d1fcdd7acd8a29dbef5136aaf0884a9dbb208c6 100644
--- a/ui/events/gestures/gesture_recognizer_impl.cc
+++ b/ui/events/gestures/gesture_recognizer_impl.cc
@@ -251,7 +251,7 @@ bool GestureRecognizerImpl::ProcessTouchEventPreDispatch(
   return gesture_provider->OnTouchEvent(event);
 }
 
-// TODO(tdresser): we should take a unique_event_id here, and validate
+// TODO(tdresser): we should take a unique_touch_event_id here, and validate
 // that the correct event is being acked. See crbug.com/457669 for
 // details.
 GestureRecognizer::Gestures*
@@ -265,12 +265,12 @@ GestureRecognizerImpl::AckAsyncTouchEvent(
 }
 
 GestureRecognizer::Gestures* GestureRecognizerImpl::AckSyncTouchEvent(
-    const uint64 unique_event_id,
+    const uint32 unique_touch_event_id,
     ui::EventResult result,
     GestureConsumer* consumer) {
   GestureProviderAura* gesture_provider =
       GetGestureProviderForConsumer(consumer);
-  gesture_provider->OnSyncTouchEventAck(unique_event_id,
+  gesture_provider->OnSyncTouchEventAck(unique_touch_event_id,
                                         result != ER_UNHANDLED);
   return gesture_provider->GetAndResetPendingGestures();
 }