UMA metrics for use count of wheel and touch scrolls.

third_party/WebKit/public/web/WebWidget.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 116 matching lines @@
   virtual bool hasTouchEventHandlersAt(const WebPoint&) { return true; }
 
   // Applies viewport related properties during a commit from the compositor
   // thread.
   virtual void applyViewportDeltas(const WebFloatSize& visualViewportDelta,
                                    const WebFloatSize& layoutViewportDelta,
                                    const WebFloatSize& elasticOverscrollDelta,
                                    float scaleFactor,
                                    float browserControlsShownRatioDelta) {}
 
+  virtual void recordWheelAndTouchScrollingCount(bool hasScrolledByWheel,
+                                                 bool hasScrolledByTouch) {}
+
   // Called to inform the WebWidget that mouse capture was lost.
   virtual void mouseCaptureLost() {}
 
   // Called to inform the WebWidget that it has gained or lost keyboard focus.
   virtual void setFocus(bool) {}
 
   // Fetches the character range of the current composition, also called the
   // "marked range."
   virtual WebRange compositionRange() { return WebRange(); }
 
@@ skipping 71 matching lines @@
     return false;
   }
 
  protected:
   ~WebWidget() {}
 };
 
 }  // namespace blink
 
 #endif