Implement compositor thread VSync aligned event queue

ui/events/blink/blink_event_util.h

Index: ui/events/blink/blink_event_util.h
diff --git a/ui/events/blink/blink_event_util.h b/ui/events/blink/blink_event_util.h
index c325290c2b758b10099f0809d043b67234356090..5b7a61f88e4d2532160bf5570000ff0ab4fd7bcb 100644
--- a/ui/events/blink/blink_event_util.h
+++ b/ui/events/blink/blink_event_util.h
@@ -31,6 +31,12 @@ struct GestureEventData;
 struct GestureEventDetails;
 class MotionEvent;
 
+bool CanCoalesce(const blink::WebInputEvent& event_to_coalesce,
+                 const blink::WebInputEvent& event);
+
+void Coalesce(const blink::WebInputEvent& event_to_coalesce,
+              blink::WebInputEvent* event);
+
 blink::WebTouchEvent CreateWebTouchEventFromMotionEvent(
     const MotionEvent& event,
     bool may_cause_scrolling);
@@ -78,6 +84,10 @@ int WebEventModifiersToEventFlags(int modifiers);
 blink::WebInputEvent::Modifiers DomCodeToWebInputEventModifiers(
     ui::DomCode code);
 
+bool IsGestureScollOrPinch(blink::WebInputEvent::Type);
+
+bool IsContinuousGestureEvent(blink::WebInputEvent::Type);
+
 }  // namespace ui
 
 #endif  // UI_EVENTS_BLINK_BLINK_EVENT_UTIL_H_