Set the target lazily for the coalesced events

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

Index: third_party/WebKit/Source/core/events/PointerEvent.h
diff --git a/third_party/WebKit/Source/core/events/PointerEvent.h b/third_party/WebKit/Source/core/events/PointerEvent.h
index 971f7497687edc6d5581c133ba2af0a16350ba97..1b774cde123580fef2fac4b40b7a01d95f14387b 100644
--- a/third_party/WebKit/Source/core/events/PointerEvent.h
+++ b/third_party/WebKit/Source/core/events/PointerEvent.h
@@ -40,8 +40,9 @@ class CORE_EXPORT PointerEvent final : public MouseEvent {
   bool IsPointerEvent() const override;
 
   EventDispatchMediator* CreateMediator() override;
+  void ReceivedTarget() override;
 
-  HeapVector<Member<PointerEvent>> getCoalescedEvents() const;
+  HeapVector<Member<PointerEvent>> getCoalescedEvents();
 
   DECLARE_VIRTUAL_TRACE();
 
@@ -61,6 +62,8 @@ class CORE_EXPORT PointerEvent final : public MouseEvent {
   String pointer_type_;
   bool is_primary_;
 
+  bool coalesced_events_targets_dirty_;
+
   HeapVector<Member<PointerEvent>> coalesced_events_;
 };