Track plugin input event latency

ppapi/shared_impl/ppb_input_event_shared.cc

Index: ppapi/shared_impl/ppb_input_event_shared.cc
diff --git a/ppapi/shared_impl/ppb_input_event_shared.cc b/ppapi/shared_impl/ppb_input_event_shared.cc
index 3443759351f17f6e6d9b29f470e25ecada86eee9..0f9034304c3358cf3f9071ee4e7f15f33662a17d 100644
--- a/ppapi/shared_impl/ppb_input_event_shared.cc
+++ b/ppapi/shared_impl/ppb_input_event_shared.cc
@@ -4,6 +4,7 @@
 
 #include "ppapi/shared_impl/ppb_input_event_shared.h"
 
+#include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/shared_impl/var.h"
 
 using ppapi::thunk::PPB_InputEvent_API;
@@ -191,6 +192,16 @@ PP_TouchPoint PPB_InputEvent_Shared::GetTouchById(PP_TouchListType list,
   return PP_MakeTouchPoint();
 }
 
+void PPB_InputEvent_Shared::TraceInputLatency(PP_Bool has_damage) {
+  ui::LatencyInfo latency = data_.latency_info;
+  if (has_damage) {
+    PpapiGlobals::Get()->AddLatencyInfo(latency, pp_instance());
+  } else {
+    latency.AddLatencyNumber(
+        ui::INPUT_EVENT_LATENCY_TERMINATED_PLUGIN_COMPONENT, 0, 0);
+  }
+}
+
 // static
 PP_Resource PPB_InputEvent_Shared::CreateIMEInputEvent(
     ResourceObjectType type,