Re-enable Eager Gesture Recognition on Aura

ui/events/event_constants.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_EVENTS_EVENT_CONSTANTS_H_
 #define UI_EVENTS_EVENT_CONSTANTS_H_
 
 namespace ui {
 
 // Event types. (prefixed because of a conflict with windows headers)
@@ skipping 101 matching lines @@
   EF_IS_TRIPLE_CLICK     = 1 << 17,
   EF_IS_NON_CLIENT       = 1 << 18,
   EF_FROM_TOUCH          = 1 << 19,  // Indicates this mouse event is generated
                                      // from an unconsumed touch/gesture event.
   EF_TOUCH_ACCESSIBILITY = 1 << 20,  // Indicates this event was generated from
                                      // touch accessibility mode.
 };
 
 // Result of dispatching an event.
 enum EventResult {
-  ER_UNHANDLED = 0,       // The event hasn't been handled. The event can be
-                          // propagated to other handlers.
-  ER_HANDLED   = 1 << 0,  // The event has already been handled, but it can
-                          // still be propagated to other handlers.
-  ER_CONSUMED  = 1 << 1,  // The event has been handled, and it should not be
-                          // propagated to other handlers.
+  ER_UNHANDLED = 0,      // The event hasn't been handled. The event can be
+                         // propagated to other handlers.
+  ER_HANDLED = 1 << 0,   // The event has already been handled, but it can
+                         // still be propagated to other handlers.
+  ER_CONSUMED = 1 << 1,  // The event has been handled, and it should not be
+                         // propagated to other handlers.
+  ER_DISABLE_SYNC_HANDLING =
+      1 << 2,  // The event shouldn't be handled synchronously. This
+               // happens if the event is being handled
+               // asynchronously, or if the event is invalid and
+               // shouldn't be handled at all.
 };
 
 // Phase of the event dispatch.
 enum EventPhase {
   EP_PREDISPATCH,
   EP_PRETARGET,
   EP_TARGET,
   EP_POSTTARGET,
   EP_POSTDISPATCH
 };
 
 // Device ID for Touch and Key Events.
 enum EventDeviceId {
   ED_UNKNOWN_DEVICE = -1
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_EVENT_CONSTANTS_H_