Add a count for Suggested Articles usage.

components/ntp_snippets/content_suggestions_metrics.cc

 // Copyright 2016 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 "components/ntp_snippets/content_suggestions_metrics.h"
 
 #include <string>
 #include <type_traits>
 
 #include "base/metrics/histogram.h"
 #include "base/metrics/histogram_macros.h"
+#include "base/metrics/user_metrics.h"
 #include "base/strings/stringprintf.h"
 #include "base/template_util.h"
 
 namespace ntp_snippets {
 namespace metrics {
 
 namespace {
 
 const int kMaxSuggestionsPerCategory = 10;
 const int kMaxSuggestionsTotal = 50;
@@ skipping 11 matching lines @@
     "NewTabPage.ContentSuggestions.OpenDisposition";
 const char kHistogramMenuOpened[] = "NewTabPage.ContentSuggestions.MenuOpened";
 const char kHistogramMenuOpenedAge[] =
     "NewTabPage.ContentSuggestions.MenuOpenedAge";
 const char kHistogramMenuOpenedScore[] =
     "NewTabPage.ContentSuggestions.MenuOpenedScore";
 const char kHistogramDismissedUnvisited[] =
     "NewTabPage.ContentSuggestions.DismissedUnvisited";
 const char kHistogramDismissedVisited[] =
     "NewTabPage.ContentSuggestions.DismissedVisited";
-const char kHistogramUsageTimeLocal[] =
+const char kHistogramArticlesUsageTimeLocal[] =
     "NewTabPage.ContentSuggestions.UsageTimeLocal";
 const char kHistogramVisitDuration[] =
     "NewTabPage.ContentSuggestions.VisitDuration";
 const char kHistogramMoreButtonShown[] =
     "NewTabPage.ContentSuggestions.MoreButtonShown";
 const char kHistogramMoreButtonClicked[] =
     "NewTabPage.ContentSuggestions.MoreButtonClicked";
 
 const char kPerCategoryHistogramFormat[] = "%s.%s";
 
@@ skipping 112 matching lines @@
 // bucket is increased.
 void RecordContentSuggestionsUsage() {
   const int kBucketSizeMins = 20;
   const int kNumBuckets = 24 * 60 / kBucketSizeMins;
 
   base::Time::Exploded now_exploded;
   base::Time::Now().LocalExplode(&now_exploded);
   size_t bucket =
       (now_exploded.hour * 60 + now_exploded.minute) / kBucketSizeMins;
 
-  UMA_HISTOGRAM_ENUMERATION(kHistogramUsageTimeLocal, bucket, kNumBuckets);
+  UMA_HISTOGRAM_ENUMERATION(kHistogramArticlesUsageTimeLocal, bucket,
+                            kNumBuckets);
 
-  LOG(ERROR) << " ****************** Zine Usage";
+  base::RecordAction(
+      base::UserMetricsAction("NewTabPage_ContentSuggestions_ArticlesUsage"));
 }
 
 }  // namespace
 
 void OnPageShown(
     const std::vector<std::pair<Category, int>>& suggestions_per_category) {
   int suggestions_total = 0;
   for (const std::pair<Category, int>& item : suggestions_per_category) {
     LogCategoryHistogramEnumeration(kHistogramCountOnNtpOpened, item.first,
                                     item.second, kMaxSuggestionsPerCategory);
@@ skipping 104 matching lines @@
 
 void OnMoreButtonClicked(Category category, int position) {
   // The "more" card can appear in addition to the actual suggestions, so add
   // one extra bucket to this histogram.
   LogCategoryHistogramEnumeration(kHistogramMoreButtonClicked, category,
                                   position, kMaxSuggestionsPerCategory + 1);
 }
 
 }  // namespace metrics
 }  // namespace ntp_snippets