Build a basic Mojo service framework for device/usb

device/usb/public/interfaces/device_manager.mojom

Index: device/usb/public/interfaces/device_manager.mojom
diff --git a/device/usb/public/interfaces/device_manager.mojom b/device/usb/public/interfaces/device_manager.mojom
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+// 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;
+
+import "device.mojom";
+
+struct DeviceFilter {
+  bool has_vendor_id;
+  uint16 vendor_id;
+
+  bool has_product_id;
+  uint16 product_id;
+
+  bool has_class_code;
+  uint8 class_code;
+
+  bool has_subclass_code;
+  uint8 subclass_code;
+
+  bool has_protocol_code;
+  uint8 protocol_code;
+};
+
+struct EnumerationOptions {
+  array<DeviceFilter> filters;
+};
+
+// TODO(rockot): Remove this wrapper struct. Mojom bindings do not yet support
+// arrays of interfaces.
+struct EnumerationResult {
+  Device device;
+};
+
+interface DeviceManager {
+  GetDevices(EnumerationOptions options) => (array<EnumerationResult> results);
+};