Add cross platform Bluetooth testing fixture for Windows.

device/bluetooth/bluetooth_adapter_win.h

 // Copyright (c) 2012 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 DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_WIN_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_WIN_H_
 
 #include <stddef.h>
 
 #include <set>
@@ skipping 82 matching lines @@
     return socket_thread_;
   }
 
  protected:
   // BluetoothAdapter:
   void RemovePairingDelegateInternal(
       device::BluetoothDevice::PairingDelegate* pairing_delegate) override;
 
  private:
   friend class BluetoothAdapterWinTest;
+  friend class BluetoothTestWin;
 
   enum DiscoveryStatus {
     NOT_DISCOVERING,
     DISCOVERY_STARTING,
     DISCOVERING,
     DISCOVERY_STOPPING
   };
 
   explicit BluetoothAdapterWin(const InitCallback& init_callback);
   ~BluetoothAdapterWin() override;
@@ skipping 42 matching lines @@
   // NOTE: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<BluetoothAdapterWin> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothAdapterWin);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_ADAPTER_WIN_H_