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 7841307a4b5c354240818fdd655293926229294c..acdc7d454dbb13922fb1a64b841014e2deb37b06 100644
--- a/content/renderer/render_widget.h
+++ b/content/renderer/render_widget.h
@@ -8,6 +8,7 @@
 #include <deque>
 #include <map>
 
+#include "base/auto_reset.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
@@ -159,6 +160,10 @@ 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).
@@ -667,6 +672,8 @@ 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)