[NTP::Push] Add Content Suggestions GCM App Handler

components/ntp_snippets/breaking_news/subscription_manager.h

Index: components/ntp_snippets/breaking_news/subscription_manager.h
diff --git a/components/ntp_snippets/breaking_news/subscription_manager.h b/components/ntp_snippets/breaking_news/subscription_manager.h
index e30447d36432ebff63177ffedfe4fb33f977c0d2..9833611854293b252a7a9b494102d449c5886b91 100644
--- a/components/ntp_snippets/breaking_news/subscription_manager.h
+++ b/components/ntp_snippets/breaking_news/subscription_manager.h
@@ -14,34 +14,47 @@ class PrefRegistrySimple;
 
 namespace ntp_snippets {
 
+// Class that wraps around the functionality of SubscriptionJsonRequest. It uses
+// the SubscriptionJsonRequest to send subscription and unsubscription requests
+// to the content suggestions server and does the bookkeeping for the data used
+// for subscription. Bookkeeping is required to detect any change (e.g. the
+// token render invalid), and resubscribe accordingly.
 class SubscriptionManager {
  public:
   SubscriptionManager(
       scoped_refptr<net::URLRequestContextGetter> url_request_context_getter,
       PrefService* pref_service,
-      const GURL& subscribe_url);
+      const GURL& subscribe_url,
+      const GURL& unsubscribe_url);
 
   ~SubscriptionManager();
 
   void Subscribe(const std::string& token);
+  bool CanSubscribeNow();
   void Unsubscribe(const std::string& token);
+  bool CanUnsubscribeNow();
+  bool IsSubscribed();
 
   static void RegisterProfilePrefs(PrefRegistrySimple* registry);
 
  private:
   std::string subscription_token_;
+  std::string unsubscription_token_;
 
   // Holds the URL request context.
   scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
 
   std::unique_ptr<internal::SubscriptionJsonRequest> subscription_request_;
+  std::unique_ptr<internal::SubscriptionJsonRequest> unsubscription_request_;
 
   PrefService* pref_service_;
 
-  // API endpoint for subscribing.
+  // API endpoint for subscribing and unsubscribing.
   const GURL subscribe_url_;
+  const GURL unsubscribe_url_;
 
   void DidSubscribe(const ntp_snippets::Status& status);
+  void DidUnsubscribe(const ntp_snippets::Status& status);
 
   DISALLOW_COPY_AND_ASSIGN(SubscriptionManager);
 };