Stop showing notifications if they're ignored

chrome/browser/ntp_snippets/ntp_snippets_metrics.h

+// 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.
+
+#ifndef CHROME_BROWSER_NTP_SNIPPETS_NTP_SNIPPETS_METRICS_H_
+#define CHROME_BROWSER_NTP_SNIPPETS_NTP_SNIPPETS_METRICS_H_
+
+enum ContentSuggestionsNotificationImpression {
+  CONTENT_SUGGESTIONS_ARTICLE = 0,  // Server-provided "articles" category.
+  CONTENT_SUGGESTIONS_NONARTICLE,   // Anything else.
+
+  MAX_CONTENT_SUGGESTIONS_NOTIFICATION_IMPRESSION
+};
+
+enum ContentSuggestionsNotificationAction {
+  CONTENT_SUGGESTIONS_TAP = 0,    // User tapped notification to open article.
+  CONTENT_SUGGESTIONS_DISMISSAL,  // User swiped notification to dismiss it.
+
+  CONTENT_SUGGESTIONS_HIDE_DEADLINE,   // notification_extra().deadline passed.
+  CONTENT_SUGGESTIONS_HIDE_EXPIRY,     // NTP no longer shows notified article.
+  CONTENT_SUGGESTIONS_HIDE_FRONTMOST,  // Chrome became the frontmost app.
+  CONTENT_SUGGESTIONS_HIDE_DISABLED,   // NTP no longer shows whole category.
+  CONTENT_SUGGESTIONS_HIDE_SHUTDOWN,   // Content sugg service is shutting down.
+
+  MAX_CONTENT_SUGGESTIONS_NOTIFICATION_ACTION
+};
+
+enum ContentSuggestionsNotificationOptOut {
+  CONTENT_SUGGESTIONS_IMPLICIT = 0,  // User ignored notifications.
+  CONTENT_SUGGESTIONS_EXPLICIT,      // User explicitly opted-out.
+
+  MAX_CONTENT_SUGGESTIONS_NOTIFICATION_OPT_OUT
+};
+
+void RecordContentSuggestionsNotificationImpression(
+    ContentSuggestionsNotificationImpression what);
+void RecordContentSuggestionsNotificationAction(
+    ContentSuggestionsNotificationAction what);
+void RecordContentSuggestionsNotificationOptOut(
+    ContentSuggestionsNotificationOptOut what);
+
+#endif  // CHROME_BROWSER_NTP_SNIPPETS_NTP_SNIPPETS_METRICS_H_