Add UMA metric for tracking listeners for blocking touch while fling is happening

third_party/WebKit/Source/web/WebInputEventConversion.cpp

 /*
  * 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 452 matching lines @@
     m_radius = scaleSizeToWindow(widget, FloatSize(point.radiusX, point.radiusY));
     m_rotationAngle = point.rotationAngle;
 }
 
 PlatformTouchEventBuilder::PlatformTouchEventBuilder(Widget* widget, const WebTouchEvent& event)
 {
     m_type = toPlatformTouchEventType(event.type);
     m_modifiers = event.modifiers;
     m_timestamp = event.timeStampSeconds;
     m_causesScrollingIfUncanceled = event.movedBeyondSlopRegion;
+    m_isFlingInProgress = event.isFlingInProgress;
 
     for (unsigned i = 0; i < event.touchesLength; ++i)
         m_touchPoints.append(PlatformTouchPointBuilder(widget, event.touches[i]));
 
     m_dispatchType = toPlatformDispatchType(event.dispatchType);
 }
 
 static FloatPoint convertAbsoluteLocationForLayoutObjectFloat(const LayoutPoint& location, const LayoutObject& layoutObject)
 {
     return layoutObject.absoluteToLocal(FloatPoint(location), UseTransforms);
@@ skipping 318 matching lines @@
         break;
     case GestureSourceTouchscreen:
         sourceDevice = WebGestureDeviceTouchscreen;
         break;
     case GestureSourceUninitialized:
         NOTREACHED();
     }
 }
 
 } // namespace blink