UMA metrics for use count of wheel and touch scrolls.

third_party/WebKit/Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 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 3995 matching lines @@
     m_doubleTapZoomPending = false;
     visualViewport.userDidChangeScale();
   }
 
   m_elasticOverscroll += elasticOverscrollDelta;
 
   if (mainFrameImpl() && mainFrameImpl()->frameView())
     mainFrameImpl()->frameView()->didUpdateElasticOverscroll();
 }
 
+void WebViewImpl::RecordWheelAndTouchScrollingCount(bool hasScrolledByWheel,
+                                                    bool hasScrolledByTouch) {
+  if (!page() || !page()->mainFrame())
+    return;
+
+  if (hasScrolledByWheel)
+    UseCounter::count(page()->mainFrame(), UseCounter::ScrollByWheel);
+  if (hasScrolledByTouch)
+    UseCounter::count(page()->mainFrame(), UseCounter::ScrollByTouch);
+}
+
 void WebViewImpl::updateLayerTreeViewport() {
   if (!page() || !m_layerTreeView)
     return;
 
   m_layerTreeView->setPageScaleFactorAndLimits(
       pageScaleFactor(), minimumPageScaleFactor(), maximumPageScaleFactor());
 }
 
 void WebViewImpl::updateLayerTreeBackgroundColor() {
   if (!m_layerTreeView)
@@ skipping 148 matching lines @@
   if (focusedFrame->localFrameRoot() != mainFrameImpl()->frame())
     return nullptr;
   return focusedFrame;
 }
 
 LocalFrame* WebViewImpl::focusedLocalFrameAvailableForIme() const {
   return m_imeAcceptEvents ? focusedLocalFrameInWidget() : nullptr;
 }
 
 }  // namespace blink