Track plugin input event latency

ppapi/proxy/graphics_2d_resource.cc

Index: ppapi/proxy/graphics_2d_resource.cc
diff --git a/ppapi/proxy/graphics_2d_resource.cc b/ppapi/proxy/graphics_2d_resource.cc
index 0cf746570042c15c50c751849e7931bdbe067115..ea8a9c52ce41727c0c61c2f55ebfc807106b5692 100644
--- a/ppapi/proxy/graphics_2d_resource.cc
+++ b/ppapi/proxy/graphics_2d_resource.cc
@@ -122,9 +122,12 @@ int32_t Graphics2DResource::Flush(scoped_refptr<TrackedCallback> callback) {
     return PP_ERROR_INPROGRESS;  // Can't have >1 flush pending.
   current_flush_callback_ = callback;
 
+  std::vector<ui::LatencyInfo> latency_info;
+  PpapiGlobals::Get()->TransferLatencyInfoTo(&latency_info, pp_instance());
+
   Call<PpapiPluginMsg_Graphics2D_FlushAck>(
       RENDERER,
-      PpapiHostMsg_Graphics2D_Flush(),
+      PpapiHostMsg_Graphics2D_Flush(latency_info),
       base::Bind(&Graphics2DResource::OnPluginMsgFlushACK, this));
   return PP_OK_COMPLETIONPENDING;
 }