Centered flood fill style ink drop ripples on mouse/touch points.

ui/events/event_utils.cc

Index: ui/events/event_utils.cc
diff --git a/ui/events/event_utils.cc b/ui/events/event_utils.cc
index a079ff22b620093e8673b61d7945ead6a257393b..98214e35bf92d5a9b1781be75bfc1a2ec6ad1e4a 100644
--- a/ui/events/event_utils.cc
+++ b/ui/events/event_utils.cc
@@ -61,6 +61,10 @@ int RegisterCustomEventType() {
   return ++g_custom_event_types;
 }
 
+const ui::LocatedEvent* ToLocatedEventOrNull(const ui::Event* event) {
+  return event && event->IsLocatedEvent() ? event->AsLocatedEvent() : nullptr;
+}
+
 base::TimeTicks EventTimeForNow() {
   return base::TimeTicks::Now();
 }