Re-enable Eager Gesture Recognition on Aura

ui/events/event.h

Index: ui/events/event.h
diff --git a/ui/events/event.h b/ui/events/event.h
index 56fd74c85d53d17d000fa1b9c6c0796104379056..52006550dac593bf44179d724cf64bca9ff9338c 100644
--- a/ui/events/event.h
+++ b/ui/events/event.h
@@ -203,6 +203,12 @@ class EVENTS_EXPORT Event {
   // Returns true if the event has a valid |native_event_|.
   bool HasNativeEvent() const;
 
+  // Marks the event as not participating in synchronous gesture recognition.
+  void DisableSynchronousHandling();
+  bool synchronous_handling_disabled() const {
+    return !!(result_ & ER_DISABLE_SYNC_HANDLING);
+  }
+
   // Immediately stops the propagation of the event. This must be called only
   // from an EventHandler during an event-dispatch. Any event handler that may
   // be in the list will not receive the event after this is called.