Report LatencyInfo through trace buffer

content/browser/renderer_host/input/touch_event_queue.h

Index: content/browser/renderer_host/input/touch_event_queue.h
diff --git a/content/browser/renderer_host/input/touch_event_queue.h b/content/browser/renderer_host/input/touch_event_queue.h
index 4d761823d9da646f003d8fdd118d02d8f369712e..807c423e12bdd4744aee1ee0303b09cc29434a36 100644
--- a/content/browser/renderer_host/input/touch_event_queue.h
+++ b/content/browser/renderer_host/input/touch_event_queue.h
@@ -28,8 +28,9 @@ class CONTENT_EXPORT TouchEventQueueClient {
       const TouchEventWithLatencyInfo& event) = 0;
 
   virtual void OnTouchEventAck(
-      const TouchEventWithLatencyInfo& event,
-      InputEventAckState ack_result) = 0;
+      const WebKit::WebTouchEvent& event,
+      InputEventAckState ack_result,
+      ui::LatencyInfo* latency) = 0;
 };
 
 // A queue for throttling and coalescing touch-events.
@@ -50,7 +51,7 @@ class CONTENT_EXPORT TouchEventQueue {
   // At this point, the queue may send one or more gesture events and/or
   // additional queued touch-events to the renderer.
   void ProcessTouchAck(InputEventAckState ack_result,
-                       const ui::LatencyInfo& latency_info);
+                       ui::LatencyInfo* latency_info);
 
   // Empties the queue of touch events. This may result in any number of gesture
   // events being sent to the renderer.
@@ -82,7 +83,7 @@ class CONTENT_EXPORT TouchEventQueue {
   // Pops the touch-event from the top of the queue and sends it to the
   // TouchEventQueueClient. This reduces the size of the queue by one.
   void PopTouchEventToClient(InputEventAckState ack_result,
-                             const ui::LatencyInfo& renderer_latency_info);
+                             ui::LatencyInfo* renderer_latency_info);
 
   bool ShouldForwardToRenderer(const WebKit::WebTouchEvent& event) const;