[NTP::Push] Adding Breaking News Subscription Manager

components/ntp_snippets/pref_names.h

Index: components/ntp_snippets/pref_names.h
diff --git a/components/ntp_snippets/pref_names.h b/components/ntp_snippets/pref_names.h
index fe3e198c83eec1202ee9b8b986e3e5bf32e061e8..6e672be4a811f70ac5bfc1a6308d4d9a7118a8ab 100644
--- a/components/ntp_snippets/pref_names.h
+++ b/components/ntp_snippets/pref_names.h
@@ -90,6 +90,10 @@ extern const char kClickBasedCategoryRankerOrderWithClicks[];
 // The pref name for the time when last click decay has happened.
 extern const char kClickBasedCategoryRankerLastDecayTime[];
 
+// The pref name for the subscription token received from the GCM server which
+// is used when sending push updates from the server.
+extern const char kContentSuggestionsSubscriptionToken[];
+
 }  // namespace prefs
 }  // namespace ntp_snippets