[NTP::Push] Adding Breaking News Subscription Manager

components/ntp_snippets/breaking_news/breaking_news_suggestions_provider.cc

Index: components/ntp_snippets/breaking_news/breaking_news_suggestions_provider.cc
diff --git a/components/ntp_snippets/breaking_news/breaking_news_suggestions_provider.cc b/components/ntp_snippets/breaking_news/breaking_news_suggestions_provider.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9bd733ab4892194ed7f86620137ee7743738b9a1
--- /dev/null
+++ b/components/ntp_snippets/breaking_news/breaking_news_suggestions_provider.cc
@@ -0,0 +1,16 @@
+// Copyright 2017 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.
+
+#include "components/ntp_snippets/breaking_news/breaking_news_suggestions_provider.h"
+
+#include "components/ntp_snippets/pref_names.h"
+
+namespace ntp_snippets {
+// static
+void BreakingNewsSuggestionsProvider::RegisterProfilePrefs(
+    PrefRegistrySimple* registry) {
+  registry->RegisterStringPref(prefs::kContentSuggestionsSubscriptionToken,
+                               std::string());
+}
+}