Add UMA metrics to the site engagement service.

chrome/browser/engagement/site_engagement_service.h

Index: chrome/browser/engagement/site_engagement_service.h
diff --git a/chrome/browser/engagement/site_engagement_service.h b/chrome/browser/engagement/site_engagement_service.h
index d2595180054f84897fc6cd4856edd518b8e2c6e2..953726c078d1d2037c8280fc9182b616ffb64ed4 100644
--- a/chrome/browser/engagement/site_engagement_service.h
+++ b/chrome/browser/engagement/site_engagement_service.h
@@ -10,6 +10,7 @@
 #include "base/macros.h"
 #include "base/time/default_clock.h"
 #include "base/time/time.h"
+#include "chrome/browser/engagement/site_engagement_metrics.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "ui/base/page_transition_types.h"
 
@@ -56,6 +57,10 @@ class SiteEngagementScore {
   double Score() const;
   void AddPoints(double points);
 
+  // Returns true if the maximum number of points today has been added. Resets
+  // the number of points added today if the day has changed.
+  bool MaxPointsPerDayAdded();
+
   // Updates the content settings dictionary |score_dict| with the current score
   // fields. Returns true if |score_dict| changed, otherwise return false.
   bool UpdateScoreDict(base::DictionaryValue* score_dict);
@@ -127,7 +132,8 @@ class SiteEngagementService : public KeyedService,
 
   // Update the karma score of the origin matching |url| for time-on-site, based
   // on user input.
-  void HandleUserInput(const GURL& url);
+  void HandleUserInput(const GURL& url,
+                       SiteEngagementMetrics::EngagementType type);
 
   // Overridden from SiteEngagementScoreProvider:
   double GetScore(const GURL& url) override;
@@ -138,6 +144,15 @@ class SiteEngagementService : public KeyedService,
   // maximum limits for the day and overall.
   void AddPoints(const GURL& url, double points);
 
+  // Returns the number of origins with maximum daily and total engagement
+  // respectively.
+  int OriginsWithMaxDailyEngagement();
+  int OriginsWithMaxEngagement();
+
+  // Logs the total number of origins stored by the site engagement service, and
+  // the total accumulated engagement score.
+  void RecordStartupUmaStats();
+
   Profile* profile_;
 
   // The clock used to vend times.