Report LatencyInfo through trace buffer

content/browser/renderer_host/input/immediate_input_router.h

Index: content/browser/renderer_host/input/immediate_input_router.h
diff --git a/content/browser/renderer_host/input/immediate_input_router.h b/content/browser/renderer_host/input/immediate_input_router.h
index 1d1a0c0e168d3eb8814a1809b3e4575ea72f0504..0d00f798dffaec42db0b75f7457572e8a9ee1b05 100644
--- a/content/browser/renderer_host/input/immediate_input_router.h
+++ b/content/browser/renderer_host/input/immediate_input_router.h
@@ -78,8 +78,9 @@ private:
   friend class ImmediateInputRouterTest;
 
   // TouchEventQueueClient
-  virtual void OnTouchEventAck(const TouchEventWithLatencyInfo& event,
-                               InputEventAckState ack_result) OVERRIDE;
+  virtual void OnTouchEventAck(const WebKit::WebTouchEvent& event,
+                               InputEventAckState ack_result,
+                               ui::LatencyInfo* latency) OVERRIDE;
 
   bool SendMoveCaret(scoped_ptr<IPC::Message> message);
   bool SendSelectRange(scoped_ptr<IPC::Message> message);
@@ -100,7 +101,7 @@ private:
   // IPC message handlers
   void OnInputEventAck(WebKit::WebInputEvent::Type event_type,
                        InputEventAckState ack_result,
-                       const ui::LatencyInfo& latency_info);
+                       ui::LatencyInfo latency_info);
   void OnMsgMoveCaretAck();
   void OnSelectRangeAck();
   void OnHasTouchEventHandlers(bool has_handlers);
@@ -110,7 +111,7 @@ private:
   // if the event was filtered by the |client_| prior to sending.
   void ProcessInputEventAck(WebKit::WebInputEvent::Type event_type,
                             InputEventAckState ack_result,
-                            const ui::LatencyInfo& latency_info);
+                            ui::LatencyInfo* latency_info);
 
   // Called by ProcessInputEventAck() to process a keyboard event ack message.
   void ProcessKeyboardAck(int type, InputEventAckState ack_result);
@@ -118,12 +119,15 @@ private:
   // Called by ProcessInputEventAck() to process a wheel event ack message.
   // This could result in a task being posted to allow additional wheel
   // input messages to be coalesced.
-  void ProcessWheelAck(InputEventAckState ack_result);
+  void ProcessWheelAck(InputEventAckState ack_result,
+                       ui::LatencyInfo* latency_info);
 
   // Called by ProcessInputEventAck() to process a gesture event ack message.
   // This validates the gesture for suppression of touchpad taps and sends one
   // previously queued coalesced gesture if it exists.
-  void ProcessGestureAck(int type, InputEventAckState ack_result);
+  void ProcessGestureAck(int type,
+                         InputEventAckState ack_result,
+                         ui::LatencyInfo* latency);
 
   // Called on ProcessInputEventAck() to process a touch event ack message.
   // This can result in a gesture event being generated and sent back to the