Stop showing notifications if they're ignored

chrome/browser/ntp_snippets/ntp_snippets_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 "chrome/browser/ntp_snippets/ntp_snippets_metrics.h"
+
+#include "base/metrics/histogram_macros.h"
+
+namespace {
+
+const char kContentSuggestionsNotificationImpressions[] =
+    "NewTabPage.ContentSuggestions.Notifications.Impressions";
+const char kContentSuggestionsNotificationActions[] =
+    "NewTabPage.ContentSuggestions.Notifications.Actions";
+const char kContentSuggestionsNotificationOptOuts[] =
+    "NewTabPage.ContentSuggestions.Notifications.AutoOptOuts";
+
+}  // namespace
+
+void RecordContentSuggestionsNotificationImpression(
+    ContentSuggestionsNotificationImpression what) {
+  UMA_HISTOGRAM_ENUMERATION(kContentSuggestionsNotificationImpressions, what,
+                            MAX_CONTENT_SUGGESTIONS_NOTIFICATION_IMPRESSION);
+}
+
+void RecordContentSuggestionsNotificationAction(
+    ContentSuggestionsNotificationAction what) {
+  UMA_HISTOGRAM_ENUMERATION(kContentSuggestionsNotificationActions, what,
+                            MAX_CONTENT_SUGGESTIONS_NOTIFICATION_ACTION);
+}
+
+void RecordContentSuggestionsNotificationOptOut(
+    ContentSuggestionsNotificationOptOut what) {
+  UMA_HISTOGRAM_ENUMERATION(kContentSuggestionsNotificationOptOuts, what,
+                            MAX_CONTENT_SUGGESTIONS_NOTIFICATION_OPT_OUT);
+}