Record the fraction of the time without user input - Aura only

ui/aura/window_event_dispatcher.cc

Index: ui/aura/window_event_dispatcher.cc
diff --git a/ui/aura/window_event_dispatcher.cc b/ui/aura/window_event_dispatcher.cc
index 78ecee4d4604dcd3bc4fbde6f6c77c4b65b654e4..559c9524748a85e10b0cb0fc40780d28baeb5aef 100644
--- a/ui/aura/window_event_dispatcher.cc
+++ b/ui/aura/window_event_dispatcher.cc
@@ -495,6 +495,11 @@ ui::EventDispatchDetails WindowEventDispatcher::PreDispatchEvent(
   Window* target_window = static_cast<Window*>(target);
   CHECK(window()->Contains(target_window));
 
+  if (!(event->flags() & ui::EF_IS_SYNTHESIZED)) {
+    fraction_of_time_without_user_input_recorder_.RecordEventAtTime(
+        event->time_stamp());
+  }
+
   if (!dispatching_held_event_) {
     bool can_be_held = IsEventCandidateForHold(*event);
     if (!move_hold_count_ || !can_be_held) {