[NTP::Push] Adding BreakingNewsSuggestionsProvider

components/ntp_snippets/ntp_snippets_constants.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 COMPONENTS_NTP_SNIPPETS_CONSTANTS_H_
 #define COMPONENTS_NTP_SNIPPETS_CONSTANTS_H_
 
 #include "base/files/file_path.h"
 
 namespace ntp_snippets {
 
 // Name of the folder where the snippets database should be stored. This is only
 // the name of the folder, not a full path - it must be appended to e.g. the
 // profile path.
 extern const base::FilePath::CharType kDatabaseFolder[];
 
 // Server endpoints for fetching snippets.
 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
+
+// Server endpoints for push updates unsubscription.
+extern const char kPushUpdatesUnsubscriptionServer[];  // used on stable/beta
+extern const char
+    kPushUpdatesUnsubscriptionStagingServer[];  // used on dev/canary
+extern const char kPushUpdatesUnsubscriptionAlphaServer[];  // for testing
+
 }  // namespace ntp_snippets
 
 #endif