[NTP::Push] Adding Breaking News Subscription Manager

components/ntp_snippets/pref_names.cc

Index: components/ntp_snippets/pref_names.cc
diff --git a/components/ntp_snippets/pref_names.cc b/components/ntp_snippets/pref_names.cc
index bea67c36392881eb9606578e6767d4c3c2f37d60..94142761e31ddd97de58b544780b7b72693fd0d5 100644
--- a/components/ntp_snippets/pref_names.cc
+++ b/components/ntp_snippets/pref_names.cc
@@ -81,5 +81,8 @@ const char kClickBasedCategoryRankerOrderWithClicks[] =
 const char kClickBasedCategoryRankerLastDecayTime[] =
     "ntp_suggestions.click_based_category_ranker.last_decay_time";
 
+const char kContentSuggestionsSubscriptionDataToken[] =
+    "ntp_suggestions.content_suggestions_subscription_data.token";
+
 }  // namespace prefs
 }  // namespace ntp_snippets