bluetooth: Extend navigator.bluetooth IDL to include Bluetooth interface.

Source/modules/bluetooth/Bluetooth.h

+// Copyright 2014 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 Bluetooth_h
+#define Bluetooth_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class Bluetooth final : public GarbageCollected<Bluetooth>, public ScriptWrappable {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static Bluetooth* create()
+    {
+        return new Bluetooth();
+    }
+
+    void trace(Visitor*) { }
+};
+
+} // namespace blink
+
+#endif // Bluetooth_h