UMA metrics for use count of wheel and touch scrolls.

third_party/WebKit/public/web/WebWidget.h

Index: third_party/WebKit/public/web/WebWidget.h
diff --git a/third_party/WebKit/public/web/WebWidget.h b/third_party/WebKit/public/web/WebWidget.h
index 0fba421e9a371fd24f06733cd6be03ae74122762..ce979c10ac91fbdd7d5ac401344c488d5a762e6a 100644
--- a/third_party/WebKit/public/web/WebWidget.h
+++ b/third_party/WebKit/public/web/WebWidget.h
@@ -134,6 +134,9 @@ class WebWidget {
                                    float scaleFactor,
                                    float browserControlsShownRatioDelta) {}
 
+  virtual void RecordWheelAndTouchScrollingCount(bool hasScrolledByWheel,

[dtapuska, 2017/03/08 21:18:00]

lower case the first letter according to the coding conventions for blink (and
elsewhere).

[sahel, 2017/03/10 16:21:33]

Done.

+                                                 bool hasScrolledByTouch) {}
+
   // Called to inform the WebWidget that mouse capture was lost.
   virtual void mouseCaptureLost() {}