[NTP::Push] Add feature

components/ntp_snippets/features.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_FEATURES_H_
 #define COMPONENTS_NTP_SNIPPETS_FEATURES_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 33 matching lines @@
 extern const base::Feature kCategoryRanker;
 
 // Feature to allow the new Google favicon server for fetching publisher icons.
 extern const base::Feature kPublisherFaviconsFromNewServerFeature;
 
 // Parameter and its values for the kCategoryRanker feature flag.
 extern const char kCategoryRankerParameter[];
 extern const char kCategoryRankerConstantRanker[];
 extern const char kCategoryRankerClickBasedRanker[];
 
+// Feature to listen for GCM push updates from the server
+extern const base::Feature kPushUpdatesFeature;
+
 enum class CategoryRankerChoice {
   CONSTANT,
   CLICK_BASED,
 };
 
 // Returns which CategoryRanker to use according to kCategoryRanker feature.
 CategoryRankerChoice GetSelectedCategoryRanker();
 
 // Builds a CategoryRanker according to kCategoryRanker feature.
 std::unique_ptr<CategoryRanker> BuildSelectedCategoryRanker(
@@ skipping 45 matching lines @@
 constexpr int kNotificationsDefaultDailyLimit = 1;
 
 // An integer. The number of notifications that can be ignored. If the user
 // ignores this many notifications or more, we stop sending them.
 extern const char kNotificationsIgnoredLimitParam[];
 constexpr int kNotificationsIgnoredDefaultLimit = 3;
 
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_FEATURES_H_