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..ad34c002df6e6bfc8c213c9e4fb6cac0436607c9
--- /dev/null
+++ b/Source/modules/webusb/USBConfiguration.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 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 USBDevice;
+class USBInterface;
+
+class USBConfiguration
+    : public GarbageCollected<USBConfiguration>
+    , public ScriptWrappable {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static USBConfiguration* create(const USBDevice*, size_t configurationIndex);

[Reilly Grant (use Gerrit), 2015/07/28 22:51:42]

configurationIndex != configurationValue so be careful exposing this to the web.

[Ken Rockot(use gerrit already), 2015/07/28 23:21:39]

Acknowledged.

+
+    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