Use interface associations to check function permissions.

device/usb/mojo/type_converters.cc

Index: device/usb/mojo/type_converters.cc
diff --git a/device/usb/mojo/type_converters.cc b/device/usb/mojo/type_converters.cc
index b7bfd7fe0ccca69da1b9ac2775cc5c03fc51cd26..1761f0a4daecd8f391e493ce5132406bb725d960 100644
--- a/device/usb/mojo/type_converters.cc
+++ b/device/usb/mojo/type_converters.cc
@@ -186,6 +186,7 @@ TypeConverter<mojo::Array<device::usb::InterfaceInfoPtr>,
       // number, so add a new InterfaceInfo to the array and map the number.
       auto info = device::usb::InterfaceInfo::New();
       info->interface_number = interfaces[i].interface_number;
+      info->first_interface = interfaces[i].first_interface;
       iter = interface_map
                  .insert(
                      std::make_pair(interfaces[i].interface_number, info.get()))