Track plugin input event latency

content/renderer/render_widget.h

Index: content/renderer/render_widget.h
diff --git a/content/renderer/render_widget.h b/content/renderer/render_widget.h
index b7d74fb4be81a549aaebc91162051c27049110b3..8687c5ccc29283018edd815db97c71dfab8a3847 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -165,6 +165,10 @@ class CONTENT_EXPORT RenderWidget
 
   RenderWidgetCompositor* compositor() const;
 
+  const ui::LatencyInfo* current_event_latency_info() const {
+    return current_event_latency_info_;
+  }
+
   virtual scoped_ptr<cc::OutputSurface> CreateOutputSurface(bool fallback);
 
   // Callback for use with synthetic gestures (e.g. BeginSmoothScroll).
@@ -698,6 +702,8 @@ class CONTENT_EXPORT RenderWidget
   // Specified whether the compositor will run in its own thread.
   bool is_threaded_compositing_enabled_;
 
+  const ui::LatencyInfo* current_event_latency_info_;
+
   uint32 next_output_surface_id_;
 
 #if defined(OS_ANDROID)