Add scrollDelta units to GestureScrollEnd.

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 515 matching lines @@
             // determining whether the observed scroll update sequence captures
             // the entirety of the generative motion.
             bool previousUpdateInSequencePrevented;
             bool preventPropagation;
             bool inertial;
             // Default initialized to ScrollUnits::PrecisePixels.
             ScrollUnits deltaUnits;
         } scrollUpdate;
 
         struct {
+            // The original delta units the scrollBegin and scrollUpdates
+            // were sent as.
+            ScrollUnits deltaUnits;
+        } scrollEnd;
+
+        struct {
             float velocityX;
             float velocityY;
             // If true, this event will skip hit testing to find a scroll
             // target and instead just scroll the viewport.
             bool targetViewport;
         } flingStart;
 
         struct {
             // If set to true, don't treat flingCancel
             // as a part of fling boost events sequence.
@@ skipping 52 matching lines @@
         , uniqueTouchEventId(0)
     {
     }
 };
 
 #pragma pack(pop)
 
 } // namespace blink
 
 #endif