Add WebUSB bindings and client interface [part 1]

Source/modules/webusb/USBDevice.h

+// 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 USBDevice_h
+#define USBDevice_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class USBControlTransferParameters;
+
+class USBDevice
+    : public GarbageCollectedFinalized<USBDevice>
+    , public ScriptWrappable {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static USBDevice* create();
+
+    USBDevice();
+    virtual ~USBDevice() { }
+
+    String guid() const
+    {
+        ASSERT_NOT_REACHED();
+        return "";
+    }
+
+    DEFINE_INLINE_TRACE() { }
+};
+
+} // namespace blink
+
+#endif // USBDevice_h