Add WebUSB bindings and client interface [part 1]

Source/modules/webusb/USBDeviceEnumerationOptions.idl

Index: Source/modules/webusb/USBDeviceEnumerationOptions.idl
diff --git a/Source/modules/webusb/USBDeviceEnumerationOptions.idl b/Source/modules/webusb/USBDeviceEnumerationOptions.idl
new file mode 100644
index 0000000000000000000000000000000000000000..ec9a3c401e64a120179e69cc351fcc2879f078be
--- /dev/null
+++ b/Source/modules/webusb/USBDeviceEnumerationOptions.idl
@@ -0,0 +1,9 @@
+// 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.
+
+// http://reillyeon.github.io/webusb/#device-enumeration
+
+dictionary USBDeviceEnumerationOptions {
+    required sequence<USBDeviceFilter> filters;
+};