[VSync Queue] Plug touch ack to gesture events and flush vsync queue if necessary

ui/events/gestures/gesture_recognizer.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_GESTURES_GESTURE_RECOGNIZER_H_
 #define UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 19 matching lines @@
 
   // Invoked before event dispatch. If the event is invalid given the current
   // touch sequence, returns false.
   virtual bool ProcessTouchEventPreDispatch(TouchEvent* event,
                                             GestureConsumer* consumer) = 0;
 
   // Returns a list of zero or more GestureEvents. Acks the gesture packet in
   // the queue which matches with unique_event_id.
   virtual Gestures AckTouchEvent(uint32_t unique_event_id,
                                  ui::EventResult result,
+                                 bool is_source_touch_event_set_non_blocking,
                                  GestureConsumer* consumer) = 0;
 
   // This is called when the consumer is destroyed. So this should cleanup any
   // internal state maintained for |consumer|. Returns true iff there was
   // state relating to |consumer| to clean up.
   virtual bool CleanupStateForConsumer(GestureConsumer* consumer) = 0;
 
   // Return the window which should handle this TouchEvent, in the case where
   // the touch is already associated with a target.
   // Otherwise, returns null.
@@ skipping 38 matching lines @@
 
   // Unsubscribes |helper| from async gesture dispatch.
   // Since the GestureRecognizer does not own the |helper|, it is not deleted
   // and must be cleaned up appropriately by the caller.
   virtual void RemoveGestureEventHelper(GestureEventHelper* helper) = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_GESTURES_GESTURE_RECOGNIZER_H_