Add telemetry to track the time an event spent waiting for the main thread.

content/browser/renderer_host/render_widget_host_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <deque>
 #include <list>
 #include <map>
@@ skipping 717 matching lines @@
   virtual bool OnSendTouchEventImmediately(
       const TouchEventWithLatencyInfo& touch_event) OVERRIDE;
   virtual bool OnSendGestureEventImmediately(
       const GestureEventWithLatencyInfo& gesture_event) OVERRIDE;
   virtual void OnKeyboardEventAck(const NativeWebKeyboardEvent& event,
                                   InputEventAckState ack_result) OVERRIDE;
   virtual void OnWheelEventAck(const WebKit::WebMouseWheelEvent& event,
                                InputEventAckState ack_result) OVERRIDE;
   virtual void OnTouchEventAck(const TouchEventWithLatencyInfo& event,
                                InputEventAckState ack_result) OVERRIDE;
-  virtual void OnGestureEventAck(const WebKit::WebGestureEvent& event,
+  virtual void OnGestureEventAck(const GestureEventWithLatencyInfo& event,
                                  InputEventAckState ack_result) OVERRIDE;
   virtual void OnUnexpectedEventAck(bool bad_message) OVERRIDE;
 
   void SimulateTouchGestureWithMouse(const WebKit::WebMouseEvent& mouse_event);
 
   // Called when there is a new auto resize (using a post to avoid a stack
   // which may get in recursive loops).
   void DelayedAutoResized();
 
+  // Helper function to record impl thread to main thread event latency.
+  void UpdateRenderingStatsForImplThreadLatency(
+      WebKit::WebInputEvent::Type type,
+      const ui::LatencyInfo& latency_info);
 
   // Our delegate, which wants to know mainly about keyboard events.
   // It will remain non-NULL until DetachDelegate() is called.
   RenderWidgetHostDelegate* delegate_;
 
   // Created during construction but initialized during Init*(). Therefore, it
   // is guaranteed never to be NULL, but its channel may be NULL if the
   // renderer crashed, so you must always check that.
   RenderProcessHost* process_;
 
@@ skipping 158 matching lines @@
   int64 last_input_number_;
 
   BrowserRenderingStats rendering_stats_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_