Build a basic Mojo service framework for device/usb

device/usb/public/interfaces/device.mojom

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+module device.usb;
+
+enum TransferDirection {
+  IN,
+  OUT,
+};
+
+enum EndpointType {
+  BULK,
+  INTERRUPT,
+  ISOCHRONOUS,
+};
+
+struct EndpointInfo {
+  uint8 endpoint_number;
+  TransferDirection direction;
+  EndpointType type;
+  uint32 packet_size;
+};
+
+struct AlternateInterfaceInfo {
+  uint8 alternate_setting;
+  uint8 class_code;
+  uint8 subclass_code;
+  uint8 protocol_code;
+  string? interface_name;
+  array<EndpointInfo> endpoints;
+};
+
+struct InterfaceInfo {
+  uint8 interface_number;
+  array<AlternateInterfaceInfo> alternates;
+};
+
+struct ConfigurationInfo {
+  uint8 configuration_value;
+  string? configuration;
+  array<InterfaceInfo> interfaces;
+};
+
+struct DeviceInfo {
+  uint16 usb_version;
+  uint8 class_code;
+  uint8 subclass_code;
+  uint8 protocol_code;
+  uint16 vendor_id;
+  uint16 product_id;
+  uint16 device_version;
+  string? manufacturer;
+  string? product;
+  string? serial_number;
+  array<ConfigurationInfo> configurations;
+};
+
+interface Device {
+  GetDeviceInfo() => (DeviceInfo info);
+};