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

ui/events/gesture_event_details.h

 // Copyright 2014 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_GESTURE_DETECTION_GESTURE_EVENT_DETAILS_H_
 #define UI_EVENTS_GESTURE_DETECTION_GESTURE_EVENT_DETAILS_H_
 
 #include <string.h>
 
 #include "base/logging.h"
@@ skipping 27 matching lines @@
   // is compatible and sufficient for that expected by gestures of |type|.
   GestureEventDetails(EventType type, const GestureEventDetails& other);
 
   EventType type() const { return type_; }
 
   GestureDeviceType device_type() const { return device_type_; }
   void set_device_type(GestureDeviceType device_type) {
     device_type_ = device_type;
   }
 
+  bool is_source_touch_event_set_non_blocking() const {
+    return is_source_touch_event_set_non_blocking_;
+  }
+  void set_is_source_touch_event_set_non_blocking(
+      bool is_source_touch_event_set_non_blocking) {
+    is_source_touch_event_set_non_blocking_ =
+        is_source_touch_event_set_non_blocking;
+  }
+
   int touch_points() const { return touch_points_; }
   void set_touch_points(int touch_points) {
     DCHECK_GT(touch_points, 0);
     touch_points_ = touch_points;
   }
 
   const gfx::Rect bounding_box() const {
     return ToEnclosingRect(bounding_box_);
   }
 
@@ skipping 160 matching lines @@
       bool down;
     } swipe;
 
     // Tap information must be set for ET_GESTURE_TAP,
     // ET_GESTURE_TAP_UNCONFIRMED, and ET_GESTURE_DOUBLE_TAP events.
     int tap_count;  // TAP repeat count.
   } data_;
 
   GestureDeviceType device_type_;
 
+  bool is_source_touch_event_set_non_blocking_ = false;

[chongz, 2017/06/19 20:24:39]

|GestureEventDetails.is_source_touch_event_set_non_blocking_ = false| is the
actual fix. 

+
   int touch_points_;  // Number of active touch points in the gesture.
 
   // Bounding box is an axis-aligned rectangle that contains all the
   // enclosing rectangles of the touch-points in the gesture.
   gfx::RectF bounding_box_;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_GESTURE_DETECTION_GESTURE_EVENT_DETAILS_H_