[NTP::Push] Adding BreakingNewsSuggestionsProvider

components/ntp_snippets/ntp_snippets_constants.h

Index: components/ntp_snippets/ntp_snippets_constants.h
diff --git a/components/ntp_snippets/ntp_snippets_constants.h b/components/ntp_snippets/ntp_snippets_constants.h
index aff5c3720d49b5a74cceb8e3c449a17aced75d51..c6cd98c25c23627863224502c54493b55680dd7f 100644
--- a/components/ntp_snippets/ntp_snippets_constants.h
+++ b/components/ntp_snippets/ntp_snippets_constants.h
@@ -19,6 +19,12 @@ extern const char kContentSuggestionsServer[];         // used on stable/beta
 extern const char kContentSuggestionsStagingServer[];  // used on dev/canary
 extern const char kContentSuggestionsAlphaServer[];    // for testing
 
+// Server endpoints for push updates subscription.
+extern const char kPushUpdatesSubscriptionServer[];  // used on stable/beta
+extern const char
+    kPushUpdatesSubscriptionStagingServer[];              // used on dev/canary
+extern const char kPushUpdatesSubscriptionAlphaServer[];  // for testing
+
 }  // namespace ntp_snippets
 
 #endif