Appropriate handling for Cellular First devices.

chromeos/dbus/update_engine_client.h

Index: chromeos/dbus/update_engine_client.h
diff --git a/chromeos/dbus/update_engine_client.h b/chromeos/dbus/update_engine_client.h
index 6fa73efda5692f09c8ddc6b68ea771576ba448d9..7b57532049fb3faed0ca8546c9dbbae6cc79a493 100644
--- a/chromeos/dbus/update_engine_client.h
+++ b/chromeos/dbus/update_engine_client.h
@@ -15,6 +15,7 @@
 #include "chromeos/chromeos_export.h"
 #include "chromeos/dbus/dbus_client.h"
 #include "chromeos/dbus/dbus_client_implementation_type.h"
+#include "dbus/message.h"
 #include "third_party/cros_system_api/dbus/update_engine/dbus-constants.h"
 
 namespace chromeos {
@@ -142,6 +143,11 @@ class CHROMEOS_EXPORT UpdateEngineClient : public DBusClient {
   // Get EndOfLife status of the device and calls |callback| when completed.
   virtual void GetEolStatus(const GetEolStatusCallback& callback) = 0;
 
+  // Either allow or disallow receiving updates over cellular connections.
+  // Synchronous (blocking) method.
+  virtual std::unique_ptr<dbus::Response> SetUpdateOverCellularPermission(
+      bool allowed);
+
   // Returns an empty UpdateCheckCallback that does nothing.
   static UpdateCheckCallback EmptyUpdateCheckCallback();