Fix ui::Event::Clone() for ui::PointerEvent.

ui/events/event.h

Index: ui/events/event.h
diff --git a/ui/events/event.h b/ui/events/event.h
index 90ea9d98e03f5657a946bd5a386b9aa69dc461ee..6c0fbcc96d19ae38a2a07a7f11d764cf8bae9fdd 100644
--- a/ui/events/event.h
+++ b/ui/events/event.h
@@ -29,6 +29,7 @@ class Transform;
 
 namespace ui {
 class EventTarget;
+class PointerEvent;
 enum class DomCode;
 
 class EVENTS_EXPORT Event {
@@ -198,7 +199,7 @@ class EVENTS_EXPORT Event {
 
   bool IsLocatedEvent() const {
     return IsMouseEvent() || IsScrollEvent() || IsTouchEvent() ||
-           IsGestureEvent();
+           IsGestureEvent() || IsPointerEvent();
   }
 
   // Convenience methods to cast |this| to a GestureEvent. IsGestureEvent()
@@ -206,6 +207,11 @@ class EVENTS_EXPORT Event {
   GestureEvent* AsGestureEvent();
   const GestureEvent* AsGestureEvent() const;
 
+  // Convenience methods to cast |this| to a PointerEvent. IsPointerEvent()
+  // must be true as a precondition to calling these methods.
+  PointerEvent* AsPointerEvent();
+  const PointerEvent* AsPointerEvent() const;
+
   // Returns true if the event has a valid |native_event_|.
   bool HasNativeEvent() const;
 
@@ -648,6 +654,7 @@ class EVENTS_EXPORT PointerEvent : public LocatedEvent {
  public:
   static const int32_t kMousePointerId;
 
+  explicit PointerEvent(const PointerEvent& pointer_event);
   explicit PointerEvent(const MouseEvent& mouse_event);
   explicit PointerEvent(const TouchEvent& touch_event);