bluetooth: Add BluetoothGATTCharacteristic IDL and Blink interface

Source/modules/bluetooth/BluetoothGATTCharacteristic.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 BluetoothGATTCharacteristic_h
+#define BluetoothGATTCharacteristic_h
+
+#include "bindings/core/v8/ScriptWrappable.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+// BluetoothGATTCharacteristic represents a GATT Characteristic, which is a
+// basic data element that provides further information about a peripheral's
+// service.
+class BluetoothGATTCharacteristic final
+    : public GarbageCollected<BluetoothGATTCharacteristic>
+    , public ScriptWrappable {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    // Interface required by garbage collection.
+    DEFINE_INLINE_TRACE() { }
+};
+
+} // namespace blink
+
+#endif // BluetoothGATTCharacteristic_h