Re-enable Eager Gesture Recognition on Aura

ui/aura/window_event_dispatcher.h

Index: ui/aura/window_event_dispatcher.h
diff --git a/ui/aura/window_event_dispatcher.h b/ui/aura/window_event_dispatcher.h
index 6b1cadc54474e27e073b45397e3ac1c733c74347..62a48e596312168917c818ebadbee604da2efcb0 100644
--- a/ui/aura/window_event_dispatcher.h
+++ b/ui/aura/window_event_dispatcher.h
@@ -94,6 +94,12 @@ class AURA_EXPORT WindowEventDispatcher : public ui::EventProcessor,
                            Window* window,
                            ui::EventResult result);
 
+  // If a touch is given to the gesture recognizer, but is later
+  // determined to be invalid, it should be marked as invalid using this
+  // method. The invalid touch event must be the most recent touch
+  // event given to the gesture recognizer.
+  void IgnoreLastTouchEvent(Window* window);
+
   // These methods are used to defer the processing of mouse/touch events
   // related to resize. A client (typically a RenderWidgetHostViewAura) can call
   // HoldPointerMoves when an resize is initiated and then ReleasePointerMoves