bluetooth: Refactor Bluetooth and Stub out BluetoothInteraction.

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/ScriptPromise.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "modules/bluetooth/BluetoothDiscovery.h"
+#include "platform/heap/Handle.h"
 
 namespace blink {
 
-class Bluetooth final
-    : public BluetoothDiscovery {
+class ScriptPromise;
+class ScriptState;
+
+class Bluetooth
+    : public GarbageCollected<Bluetooth>
+    , public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static Bluetooth* create()
     {
         return new Bluetooth();
     }
+
+    // BluetoothDiscovery interface
+    ScriptPromise requestDevice(ScriptState*);
+
+    DEFINE_INLINE_TRACE()
+    {
+        visitor->trace(m_bluetoothDiscovery);
+    }
+
+private:
+    Member<BluetoothDiscovery> m_bluetoothDiscovery;
+    BluetoothDiscovery* bluetoothDiscovery();
 };
 
 } // namespace blink
 
 #endif // Bluetooth_h