[NTP::Push] Add feature

components/ntp_snippets/features.h

Index: components/ntp_snippets/features.h
diff --git a/components/ntp_snippets/features.h b/components/ntp_snippets/features.h
index 9946e7c2d0a6c76799eb4123a3f891e1829e06dd..93c7dd66b7effd4e6969242e85cb26765de341ed 100644
--- a/components/ntp_snippets/features.h
+++ b/components/ntp_snippets/features.h
@@ -51,6 +51,9 @@ extern const char kCategoryRankerParameter[];
 extern const char kCategoryRankerConstantRanker[];
 extern const char kCategoryRankerClickBasedRanker[];
 
+// Feature to listen for GCM push updates from the server

[vitaliii, 2017/05/31 10:23:55]

s/server/server.

to make it consistent with the rest of the file.

[mamir, 2017/05/31 10:52:38]

Done.

+extern const base::Feature kContentSuggestionsPushFeature;

[vitaliii, 2017/05/31 10:23:55]

Is there a reason for this location? It is right in the middle of Category
Ranker things. Should we move it in the end after all notification things?

[mamir, 2017/05/31 10:52:38]

Done.

+
 enum class CategoryRankerChoice {
   CONSTANT,
   CLICK_BASED,