Suppressed MEs for gestures from cancelled PEs

third_party/WebKit/public/web/WebInputEvent.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 477 matching lines @@
         UnknownMomentumPhase = 0, // No phase information.
         NonMomentumPhase, // Regular scrolling phase.
         MomentumPhase, // Momentum phase.
     };
 
     int x;
     int y;
     int globalX;
     int globalY;
     WebGestureDevice sourceDevice;
+
+    // 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 uniqueTouchEventId;
+
     // This field exists to allow BrowserPlugin to mark GestureScroll events as
     // 'resent' to handle the case where an event is not consumed when first
     // encountered; it should be handled differently by the plugin when it is
     // sent for thesecond time. No code within Blink touches this, other than to
     // plumb it through event conversions.
     int resendingPluginId;
 
     union {
         // Tap information must be set for GestureTap, GestureTapUnconfirmed,
         // and GestureDoubleTap events.
@@ skipping 126 matching lines @@
 
     // For a single touch, this is true after the touch-point has moved beyond
     // the platform slop region. For a multitouch, this is true after any
     // touch-point has moved (by whatever amount).
     bool movedBeyondSlopRegion;
 
     // Whether there was an active fling animation when the event was
     // dispatched.
     bool dispatchedDuringFling;
 
-    // A unique identifier for the touch event.
+    // A unique identifier for the touch event. Valid ids start at one and
+    // increase monotonically. Zero means an unknown id.
     uint32_t uniqueTouchEventId;
 
     WebTouchEvent()
         : WebInputEvent(sizeof(WebTouchEvent))
         , touchesLength(0)
         , dispatchType(Blocking)
         , movedBeyondSlopRegion(false)
         , dispatchedDuringFling(false)
         , uniqueTouchEventId(0)
     {
     }
 };
 
 #pragma pack(pop)
 
 } // namespace blink
 
 #endif