[remote suggestions] Attach the fetch time to RemoteSnippets, ContentSnippets and SnippetArticle

components/ntp_snippets/content_suggestion.h

Index: components/ntp_snippets/content_suggestion.h
diff --git a/components/ntp_snippets/content_suggestion.h b/components/ntp_snippets/content_suggestion.h
index b4e64f887dfb53e56081c18f7a463d9f31d4a724..14c65481c69b897684c0c9941c7e2e41b9c35b44 100644
--- a/components/ntp_snippets/content_suggestion.h
+++ b/components/ntp_snippets/content_suggestion.h
@@ -151,6 +151,11 @@ class ContentSuggestion {
   void set_notification_extra(
       std::unique_ptr<NotificationExtra> notification_extra);
 
+  const base::Time& fetch_time() const { return fetch_time_; }
+  void set_fetch_time(const base::Time& fetch_time) {
+    fetch_time_ = fetch_time;
+  }
+
  private:
   ID id_;
   GURL url_;
@@ -163,6 +168,10 @@ class ContentSuggestion {
   std::unique_ptr<RecentTabSuggestionExtra> recent_tab_suggestion_extra_;
   std::unique_ptr<NotificationExtra> notification_extra_;
 
+  // The time when the remote suggestion was fetched from the server. This filed

[Marc Treib, 2017/02/10 16:16:56]

s/filed/field/

[markusheintz_, 2017/02/13 09:59:55]

Done.

+  // is only populated when the ContentSuggestion is created from a
+  // RemoteSuggestion.
+  base::Time fetch_time_;

[Marc Treib, 2017/02/10 16:16:56]

fetch_date_, to be consistent with publish_date_, and expiry_date in
RemoteSuggestion?

[markusheintz_, 2017/02/13 09:59:55]

Done.

   DISALLOW_COPY_AND_ASSIGN(ContentSuggestion);

[Marc Treib, 2017/02/10 16:16:56]

nit: empty line before

[markusheintz_, 2017/02/13 09:59:55]

Done.

 };