[GCM] Adding basic G-services handling

google_apis/gcm/engine/gcm_store.h

Index: google_apis/gcm/engine/gcm_store.h
diff --git a/google_apis/gcm/engine/gcm_store.h b/google_apis/gcm/engine/gcm_store.h
index ccf480bcda078c831f18abd28f63b1c7f3b1bb15..1b15e56bcb11458b0dffd6843e1b3b93a196e260 100644
--- a/google_apis/gcm/engine/gcm_store.h
+++ b/google_apis/gcm/engine/gcm_store.h
@@ -48,6 +48,8 @@ class GCM_EXPORT GCMStore {
     RegistrationInfoMap registrations;
     std::vector<std::string> incoming_messages;
     OutgoingMessageMap outgoing_messages;
+    std::map<std::string, std::string> gservices_settings;
+    std::string gservices_digest;
     base::Time last_checkin_time;
   };
 
@@ -107,6 +109,14 @@ class GCM_EXPORT GCMStore {
   virtual void SetLastCheckinTime(const base::Time& last_checkin_time,
                                   const UpdateCallback& callback) = 0;
 
+  // G-service settings handling.
+  // Persists |settings| and |settings_digest|. It completely replaces the
+  // existing data.
+  virtual void SetGServicesSettings(
+      const std::map<std::string, std::string>& settings,
+      const std::string& settings_digest,
+      const UpdateCallback& callback) = 0;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(GCMStore);
 };