Add WebUSB bindings and client interface

Source/modules/webusb/USBConfiguration.h

Index: Source/modules/webusb/USBConfiguration.h
diff --git a/Source/modules/webusb/USBConfiguration.h b/Source/modules/webusb/USBConfiguration.h
new file mode 100644
index 0000000000000000000000000000000000000000..0871d5ae7b43cb154ef3e78f2e13a16b748cb3a5
--- /dev/null
+++ b/Source/modules/webusb/USBConfiguration.h
@@ -0,0 +1,43 @@
+// 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.
+
+#ifndef USBConfiguration_h
+#define USBConfiguration_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "platform/heap/Handle.h"
+#include "public/platform/modules/webusb/WebUSBDeviceInfo.h"
+
+namespace blink {
+
+class ExceptionState;
+class USBDevice;
+class USBInterface;
+
+class USBConfiguration
+    : public GarbageCollected<USBConfiguration>
+    , public ScriptWrappable {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static USBConfiguration* create(const USBDevice*, size_t configurationIndex);
+    static USBConfiguration* create(const USBDevice*, size_t configurationIndex, ExceptionState&);
+
+    USBConfiguration(const USBDevice*, size_t configurationIndex);
+
+    const WebUSBDeviceInfo::Configuration& info() const;
+
+    uint8_t configurationValue() const;
+    String configurationName() const;
+    HeapVector<Member<USBInterface>> interfaces() const;
+
+    DECLARE_TRACE();
+
+private:
+    Member<const USBDevice> m_device;
+    size_t m_configurationIndex;
+};
+
+} // namespace blink
+
+#endif // USBConfiguration_h