Add UMA metrics to the site engagement service.

chrome/browser/engagement/site_engagement_metrics.cc

+// 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"
+
+namespace {
+
+const char kTotalEngagementHistogram[] =
+    "SiteEngagementService.TotalEngagement";
+
+const char kTotalOriginsHistogram[] = "SiteEngagementService.OriginsEngaged";
+
+const char kEngagementByOriginHistogram[] =
+    "SiteEngagementService.EngagementByOrigin";
+
+const char kOriginsWithMaxEngagementHistogram[] =
+    "SiteEngagementService.OriginsWithMaxEngagement";
+
+const char kOriginsWithMaxDailyEngagementHistogram[] =
+    "SiteEngagementService.OriginsWithMaxDailyEngagement";
+
+const char kEngagementTypeHistogram[] = "SiteEngagementService.EngagementType";
+
+}  // anonymous namespace

[calamity, 2015/09/28 07:33:47]

nit: Just // namespace. (Matches rest of Chrome)

[dominickn, 2015/09/29 02:29:36]

Done.

+
+void SiteEngagementMetrics::RecordTotalSiteEngagement(
+    double total_engagement) {
+  UMA_HISTOGRAM_COUNTS_100(kTotalEngagementHistogram, total_engagement);

[calamity, 2015/09/28 07:33:47]

Is this a histogram of max value 100? You're gonna need a bigger boat.

[dominickn, 2015/09/29 02:29:36]

Done.

+}
+
+void SiteEngagementMetrics::RecordTotalOriginsEngaged(int num_origins) {
+  UMA_HISTOGRAM_COUNTS_100(kTotalOriginsHistogram, num_origins);

[calamity, 2015/09/28 07:33:48]

Ditto.

[dominickn, 2015/09/29 02:29:36]

Done.

+}
+
+void SiteEngagementMetrics::RecordEngagementByOrigin(
+    std::map<GURL, double> score_map) {
+  for (const auto& value: score_map)
+    UMA_HISTOGRAM_COUNTS_100(kEngagementByOriginHistogram, 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::RecordEngagement(EngagementType type) {
+  switch (type) {
+    case ENGAGEMENT_NAVIGATION:
+      UMA_HISTOGRAM_SPARSE_SLOWLY(kEngagementTypeHistogram,
+                                  ENGAGEMENT_NAVIGATION);
+      break;
+    case ENGAGEMENT_KEYPRESS:
+      UMA_HISTOGRAM_SPARSE_SLOWLY(kEngagementTypeHistogram,
+                                  ENGAGEMENT_KEYPRESS);
+      break;
+    case ENGAGEMENT_MOUSE:
+      UMA_HISTOGRAM_SPARSE_SLOWLY(kEngagementTypeHistogram, ENGAGEMENT_MOUSE);
+      break;
+    default:
+      NOTREACHED() << "Invalid type passed to RecordUserInput().";
+      break;
+  }
+}