[GCM] Adding handling of heartbeat intervals to the GCM store.

google_apis/gcm/engine/gcm_store_impl.h

Index: google_apis/gcm/engine/gcm_store_impl.h
diff --git a/google_apis/gcm/engine/gcm_store_impl.h b/google_apis/gcm/engine/gcm_store_impl.h
index 636b4becea51e33286a180f96c410688915a4e89..6ee8e88fd7bc50c27e73411d792ed6590fe5f0ad 100644
--- a/google_apis/gcm/engine/gcm_store_impl.h
+++ b/google_apis/gcm/engine/gcm_store_impl.h
@@ -95,6 +95,13 @@ class GCM_EXPORT GCMStoreImpl : public GCMStore {
   void SetLastTokenFetchTime(const base::Time& time,
                              const UpdateCallback& callback) override;
 
+  // Sets the custom client heartbeat interval for the scope.
+  void AddHeartbeatInterval(const std::string& scope,
+                            int interval_ms,
+                            const UpdateCallback& callback) override;
+  void RemoveHeartbeatInterval(const std::string& scope,
+                               const UpdateCallback& callback) override;
+
   // Injects a value to database. Only to be used for testing.
   void SetValueForTesting(const std::string& key,
                           const std::string& value,