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

ui/events/event_utils.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/events/event_utils.h"
 
 #include <vector>
 
 #include "base/metrics/histogram.h"
 #include "ui/display/display.h"
@@ skipping 43 matching lines @@
     default:
       break;
   }
   return event;
 }
 
 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();
 }
 
 bool ShouldDefaultToNaturalScroll() {
   return GetInternalDisplayTouchSupport() ==
          display::Display::TOUCH_SUPPORT_AVAILABLE;
 }
 
 display::Display::TouchSupport GetInternalDisplayTouchSupport() {
@@ skipping 32 matching lines @@
     case ET_TOUCH_RELEASED:
       UMA_HISTOGRAM_CUSTOM_COUNTS("Event.Latency.OS.TOUCH_RELEASED",
                                   delta.InMicroseconds(), 1, 1000000, 50);
       return;
     default:
       return;
   }
 }
 
 }  // namespace ui