Replace MouseWheel events with GestureScrollBegin in WebContentsObserver::DidGetUserInteraction

chrome/browser/engagement/site_engagement_metrics.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_METRICS_H_
 #define CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_METRICS_H_
 
 #include <map>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "url/gurl.h"
 
 // Helper class managing the UMA histograms for the Site Engagement Service.
 class SiteEngagementMetrics {
  public:
   // This is used to back a UMA histogram, so it should be treated as
   // append-only. Any new values should be inserted immediately prior to
   // ENGAGEMENT_LAST.
   enum EngagementType {
     ENGAGEMENT_NAVIGATION,
     ENGAGEMENT_KEYPRESS,
     ENGAGEMENT_MOUSE,
     ENGAGEMENT_TOUCH_GESTURE,
-    ENGAGEMENT_WHEEL,
+    ENGAGEMENT_SCROLL,
     ENGAGEMENT_MEDIA_HIDDEN,
     ENGAGEMENT_MEDIA_VISIBLE,
     ENGAGEMENT_WEBAPP_SHORTCUT_LAUNCH,
     ENGAGEMENT_FIRST_DAILY_ENGAGEMENT,
     ENGAGEMENT_LAST,
   };
 
   static void RecordTotalSiteEngagement(double total_engagement);
   static void RecordTotalOriginsEngaged(int total_origins);
   static void RecordMeanEngagement(double mean_engagement);
@@ skipping 26 matching lines @@
   static const char kEngagementTypeHistogram[];
   static const char kEngagementBucketHistogramBase[];
   static const char kDaysSinceLastShortcutLaunchHistogram[];
   static const char kScoreDecayedFromHistogram[];
   static const char kScoreDecayedToHistogram[];
 
   static std::vector<std::string> GetEngagementBucketHistogramNames();
 };
 
 #endif  // CHROME_BROWSER_ENGAGEMENT_SITE_ENGAGEMENT_METRICS_H_