Add getCoalescedEvents API to PointerEvent

third_party/WebKit/Source/core/events/PointerEvent.cpp

Index: third_party/WebKit/Source/core/events/PointerEvent.cpp
diff --git a/third_party/WebKit/Source/core/events/PointerEvent.cpp b/third_party/WebKit/Source/core/events/PointerEvent.cpp
index 4d63b1e14d0e8cf43088b6d10b846c4241a96d63..15e0e33dfd77a37ceffed993bb744ff4b02bc0cc 100644
--- a/third_party/WebKit/Source/core/events/PointerEvent.cpp
+++ b/third_party/WebKit/Source/core/events/PointerEvent.cpp
@@ -35,6 +35,10 @@ PointerEvent::PointerEvent(const AtomicString& type,
     m_pointerType = initializer.pointerType();
   if (initializer.hasIsPrimary())
     m_isPrimary = initializer.isPrimary();
+  if (initializer.hasCoalescedEvents()) {
+    for (auto coalescedEvent : initializer.coalescedEvents())
+      m_coalescedEvents.append(coalescedEvent);
+  }
 }
 
 bool PointerEvent::isMouseEvent() const {
@@ -49,7 +53,12 @@ EventDispatchMediator* PointerEvent::createMediator() {
   return PointerEventDispatchMediator::create(this);
 }
 
+HeapVector<Member<PointerEvent>> PointerEvent::getCoalescedEvents() const {
+  return m_coalescedEvents;
+}
+
 DEFINE_TRACE(PointerEvent) {
+  visitor->trace(m_coalescedEvents);
   MouseEvent::trace(visitor);
 }