Report LatencyInfo through trace buffer

content/browser/renderer_host/input/touch_event_queue.cc

Index: content/browser/renderer_host/input/touch_event_queue.cc
diff --git a/content/browser/renderer_host/input/touch_event_queue.cc b/content/browser/renderer_host/input/touch_event_queue.cc
index 9d0394ef162d034a0f43ebe90cb34969011867de..6e207000fd780c36d834cc178de11cd3ec821c74 100644
--- a/content/browser/renderer_host/input/touch_event_queue.cc
+++ b/content/browser/renderer_host/input/touch_event_queue.cc
@@ -69,11 +69,11 @@ class CoalescedWebTouchEvent {
     return coalesced_event_;
   }
 
-  WebTouchEventWithLatencyList::const_iterator begin() const {
+  WebTouchEventWithLatencyList::iterator begin() {
     return events_.begin();
   }
 
-  WebTouchEventWithLatencyList::const_iterator end() const {
+  WebTouchEventWithLatencyList::iterator end() {
     return events_.end();
   }
 
@@ -194,14 +194,10 @@ void TouchEventQueue::PopTouchEventToClient(
   // to the renderer, or touch-events being queued.
   base::AutoReset<bool> dispatching_touch_ack(&dispatching_touch_ack_, true);
 
-  base::TimeTicks now = base::TimeTicks::HighResNow();
-  for (WebTouchEventWithLatencyList::const_iterator iter = acked_event->begin(),
+  for (WebTouchEventWithLatencyList::iterator iter = acked_event->begin(),
        end = acked_event->end();
        iter != end; ++iter) {
-    ui::LatencyInfo* latency = const_cast<ui::LatencyInfo*>(&(iter->latency));
-    latency->AddNewLatencyFrom(renderer_latency_info);
-    latency->AddLatencyNumberWithTimestamp(
-        ui::INPUT_EVENT_LATENCY_ACKED_COMPONENT, 0, 0, now, 1);
+    iter->latency.AddNewLatencyFrom(renderer_latency_info);
     client_->OnTouchEventAck((*iter), ack_result);
   }
 }