Add WebUSB bindings and client interface

Source/modules/webusb/USBOutTransferResult.h

Index: Source/modules/webusb/USBOutTransferResult.h
diff --git a/Source/modules/webusb/USBOutTransferResult.h b/Source/modules/webusb/USBOutTransferResult.h
new file mode 100644
index 0000000000000000000000000000000000000000..63e2c43028982f107131b34ddf984df4545238e2
--- /dev/null
+++ b/Source/modules/webusb/USBOutTransferResult.h
@@ -0,0 +1,41 @@
+// 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 USBOutTransferResult_h
+#define USBOutTransferResult_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "platform/heap/Heap.h"
+
+namespace blink {
+
+class USBOutTransferResult
+    : public GarbageCollected<USBOutTransferResult>
+    , public ScriptWrappable {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static USBOutTransferResult* create(const String& status, unsigned bytesWritten)
+    {
+        return new USBOutTransferResult(status, bytesWritten);
+    }
+
+    USBOutTransferResult(const String& status, unsigned bytesWritten)
+        : m_status(status)
+        , m_bytesWritten(bytesWritten)
+    {
+    }
+
+    String status() const { return m_status; }
+    unsigned bytesWritten() const { return m_bytesWritten; }
+
+    DEFINE_INLINE_TRACE() { }
+
+private:
+    String m_status;
+    unsigned m_bytesWritten;
+};
+
+} // namespace blink
+
+#endif // USBOutTransferResult_h