Suppressed MEs for gestures from cancelled PEs

ui/events/event.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_H_
 #define UI_EVENTS_EVENT_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 970 matching lines @@
   float y_offset_;
   // Unaccelerated offsets.
   float x_offset_ordinal_;
   float y_offset_ordinal_;
   // Number of fingers on the pad.
   int finger_count_;
 };
 
 class EVENTS_EXPORT GestureEvent : public LocatedEvent {
  public:
+    // The constructor takes a default unique_touch_id of zero to support many
+    // (80+) existing tests that doesn't care about this id.
   GestureEvent(float x,
                float y,
                int flags,
                base::TimeTicks time_stamp,
-               const GestureEventDetails& details);
+               const GestureEventDetails& details,
+               uint32_t unique_touch_event_id = 0);
 
   // Create a new GestureEvent which is identical to the provided model.
   // If source / target windows are provided, the model location will be
   // converted from |source| coordinate system to |target| coordinate system.
   template <typename T>
   GestureEvent(const GestureEvent& model, T* source, T* target)
       : LocatedEvent(model, source, target),
         details_(model.details_) {
   }
 
   ~GestureEvent() override;
 
   const GestureEventDetails& details() const { return details_; }
 
+  uint32_t unique_touch_event_id() const {
+    return unique_touch_event_id_;
+  }
+
  private:
   GestureEventDetails details_;
+
+  // The unique id of the touch event that caused the gesture event to be
+  // dispatched. This field gets a non-zero value only for gestures that are
+  // released through TouchDispositionGestureFilter::SendGesture. The gesture
+  // events that aren't fired directly in response to processing a touch-event
+  // (e.g. timer fired ones), this id is zero. See crbug.com/618738.
+  uint32_t unique_touch_event_id_;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_EVENT_H_