WIP: Plumbing input event latency reporting through Mus GPU.

ui/events/mojo/latency_info_struct_traits.cc

Index: ui/events/mojo/latency_info_struct_traits.cc
diff --git a/ui/events/mojo/latency_info_struct_traits.cc b/ui/events/mojo/latency_info_struct_traits.cc
index d70e95768ed81b3cb850a6fb9691f22abcd0547a..0866f5cdbb0fb90ff7fe4a539c5bb20f11abcd8d 100644
--- a/ui/events/mojo/latency_info_struct_traits.cc
+++ b/ui/events/mojo/latency_info_struct_traits.cc
@@ -175,6 +175,20 @@ uint32_t StructTraits<ui::mojom::LatencyComponentDataView,
   return component.event_count;
 }
 
+//static
+base::TimeTicks StructTraits<ui::mojom::LatencyComponentDataView,
+                             ui::LatencyInfo::LatencyComponent>::
+    first_event_time(const ui::LatencyInfo::LatencyComponent& component) {
+  return component.first_event_time;
+}
+
+//static
+base::TimeTicks StructTraits<ui::mojom::LatencyComponentDataView,
+                             ui::LatencyInfo::LatencyComponent>::
+    last_event_time(const ui::LatencyInfo::LatencyComponent& component) {
+  return component.last_event_time;
+}
+
 // static
 bool StructTraits<ui::mojom::LatencyComponentDataView,
                   ui::LatencyInfo::LatencyComponent>::
@@ -182,6 +196,10 @@ bool StructTraits<ui::mojom::LatencyComponentDataView,
          ui::LatencyInfo::LatencyComponent* out) {
   if (!data.ReadEventTime(&out->event_time))
     return false;
+  if (!data.ReadFirstEventTime(&out->first_event_time))
+    return false;
+  if (!data.ReadLastEventTime(&out->last_event_time))
+    return false;
   out->sequence_number = data.sequence_number();
   out->event_count = data.event_count();
   return true;