Pass ui::LatencyInfo correct with unified gesture detector on Aura.

ui/events/gestures/gesture_provider_aura.cc

Index: ui/events/gestures/gesture_provider_aura.cc
diff --git a/ui/events/gestures/gesture_provider_aura.cc b/ui/events/gestures/gesture_provider_aura.cc
index edff9e38979939fe567cc06862a1b6b34cde1901..39642e07f324048500d06c75b75b660817d2da37 100644
--- a/ui/events/gestures/gesture_provider_aura.cc
+++ b/ui/events/gestures/gesture_provider_aura.cc
@@ -23,7 +23,6 @@ GestureProviderAura::GestureProviderAura(GestureProviderAuraClient* client)
 GestureProviderAura::~GestureProviderAura() {}
 
 bool GestureProviderAura::OnTouchEvent(const TouchEvent& event) {
-  last_touch_event_flags_ = event.flags();
   bool pointer_id_is_active = false;
   for (size_t i = 0; i < pointer_state_.GetPointerCount(); ++i) {
     if (event.touch_id() != pointer_state_.GetPointerId(i))
@@ -42,6 +41,8 @@ bool GestureProviderAura::OnTouchEvent(const TouchEvent& event) {
     return false;
   }
 
+  last_touch_event_flags_ = event.flags();
+  last_touch_event_latency_info_ = *event.latency();
   pointer_state_.OnTouch(event);
 
   bool result = filtered_gesture_provider_.OnTouchEvent(pointer_state_);
@@ -54,6 +55,7 @@ void GestureProviderAura::OnTouchEventAck(bool event_consumed) {
   DCHECK(!handling_event_);
   base::AutoReset<bool> handling_event(&handling_event_, true);
   filtered_gesture_provider_.OnTouchEventAck(event_consumed);
+  last_touch_event_latency_info_.Clear();
 }
 
 void GestureProviderAura::OnGestureEvent(
@@ -87,6 +89,19 @@ void GestureProviderAura::OnGestureEvent(
                            // be cleaned up. See crbug.com/366707.
                            1 << gesture.motion_event_id));
 
+
+  ui::LatencyInfo* gesture_latency = event->latency();
+
+  gesture_latency->CopyLatencyFrom(
+      last_touch_event_latency_info_,
+      ui::INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT);
+  gesture_latency->CopyLatencyFrom(
+      last_touch_event_latency_info_,
+      ui::INPUT_EVENT_LATENCY_UI_COMPONENT);
+  gesture_latency->CopyLatencyFrom(
+      last_touch_event_latency_info_,
+      ui::INPUT_EVENT_LATENCY_ACKED_TOUCH_COMPONENT);
+
   if (!handling_event_) {
     // Dispatching event caused by timer.
     client_->OnGestureEvent(event.get());