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

third_party/WebKit/public/platform/WebGestureEvent.h

 // Copyright 2016 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 WebGestureEvent_h
 #define WebGestureEvent_h
 
 #include "WebFloatSize.h"
 #include "WebGestureDevice.h"
 #include "WebInputEvent.h"
@@ skipping 19 matching lines @@
     kMomentumPhase,             // Momentum phase.
   };
 
   // TODO(mustaq): Make these coordinates private & fractional, as in
   // WebMouseEvent.h .
   int x;
   int y;
   int global_x;
   int global_y;
   WebGestureDevice source_device;
+  bool is_source_touch_event_set_non_blocking;
 
   // If the WebGestureEvent has sourceDevice=WebGestureDeviceTouchscreen, this
   // field contains the unique identifier for the touch event that released
   // this event at TouchDispositionGestureFilter. If the WebGestureEvents was
   // not released through a touch event (e.g. timer-released gesture events or
   // gesture events with sourceDevice!=WebGestureDeviceTouchscreen), the field
   // contains 0. See crbug.com/618738.
   uint32_t unique_touch_event_id;
 
   // This field exists to allow BrowserPlugin to mark GestureScroll events as
@@ skipping 190 matching lines @@
         return false;
     }
   }
 };
 
 #pragma pack(pop)
 
 }  // namespace blink
 
 #endif  // WebGestureEvent_h