Add UMA metrics to the site engagement service.

chrome/browser/engagement/site_engagement_metrics.cc

Index: chrome/browser/engagement/site_engagement_metrics.cc
diff --git a/chrome/browser/engagement/site_engagement_metrics.cc b/chrome/browser/engagement/site_engagement_metrics.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fb2dc6b7f2acf1c7b84dd6f3ed7d7a3a3d941025
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+++ b/chrome/browser/engagement/site_engagement_metrics.cc
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+// 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.
+
+#include "chrome/browser/engagement/site_engagement_metrics.h"
+
+#include "base/metrics/histogram_macros.h"
+#include "base/metrics/sparse_histogram.h"
+
+const char SiteEngagementMetrics::kTotalEngagementHistogram[] =
+    "SiteEngagementService.TotalEngagement";
+
+const char SiteEngagementMetrics::kTotalOriginsHistogram[] =
+    "SiteEngagementService.OriginsEngaged";
+
+const char SiteEngagementMetrics::kMeanEngagementHistogram[] =
+    "SiteEngagementService.MeanEngagement";
+
+const char SiteEngagementMetrics::kMedianEngagementHistogram[] =
+    "SiteEngagementService.MedianEngagement";
+
+const char SiteEngagementMetrics::kEngagementScoreHistogram[] =
+    "SiteEngagementService.EngagementScore";
+
+const char SiteEngagementMetrics::kOriginsWithMaxEngagementHistogram[] =
+    "SiteEngagementService.OriginsWithMaxEngagement";
+
+const char SiteEngagementMetrics::kOriginsWithMaxDailyEngagementHistogram[] =
+    "SiteEngagementService.OriginsWithMaxDailyEngagement";
+
+const char SiteEngagementMetrics::kPercentOriginsWithMaxEngagementHistogram[] =
+    "SiteEngagementService.PercentOriginsWithMaxEngagement";
+
+const char SiteEngagementMetrics::kEngagementTypeHistogram[] =
+    "SiteEngagementService.EngagementType";
+
+void SiteEngagementMetrics::RecordTotalSiteEngagement(
+    double total_engagement) {
+  UMA_HISTOGRAM_COUNTS_10000(kTotalEngagementHistogram, total_engagement);
+}
+
+void SiteEngagementMetrics::RecordTotalOriginsEngaged(int num_origins) {
+  UMA_HISTOGRAM_COUNTS_10000(kTotalOriginsHistogram, num_origins);
+}
+
+void SiteEngagementMetrics::RecordMeanEngagement(double mean_engagement) {
+  UMA_HISTOGRAM_COUNTS_100(kMeanEngagementHistogram, mean_engagement);
+}
+
+void SiteEngagementMetrics::RecordMedianEngagement(double median_engagement) {
+  UMA_HISTOGRAM_COUNTS_100(kMedianEngagementHistogram, median_engagement);
+}
+
+void SiteEngagementMetrics::RecordEngagementScores(
+    std::map<GURL, double> score_map) {
+  for (const auto& value: score_map) {
+    UMA_HISTOGRAM_COUNTS_100(kEngagementScoreHistogram, value.second);
+  }
+}
+
+void SiteEngagementMetrics::RecordOriginsWithMaxEngagement(int total_origins) {
+  UMA_HISTOGRAM_COUNTS_100(kOriginsWithMaxEngagementHistogram, total_origins);
+}
+
+void SiteEngagementMetrics::RecordOriginsWithMaxDailyEngagement(
+    int total_origins) {
+  UMA_HISTOGRAM_COUNTS_100(kOriginsWithMaxDailyEngagementHistogram,
+                           total_origins);
+}
+
+void SiteEngagementMetrics::RecordPercentOriginsWithMaxEngagement(
+    double percentage) {
+  UMA_HISTOGRAM_COUNTS_100(kPercentOriginsWithMaxEngagementHistogram,
+                           percentage);
+}
+
+void SiteEngagementMetrics::RecordEngagement(EngagementType type) {
+  UMA_HISTOGRAM_ENUMERATION(kEngagementTypeHistogram, type, ENGAGEMENT_LAST);
+}