[Bluetooth] Improve the adapter's awareness of connected devices.

device/bluetooth/bluetooth_rfcomm_channel_mac.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 DEVICE_BLUETOOTH_BLUETOOTH_RFCOMM_CHANNEL_MAC_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_RFCOMM_CHANNEL_MAC_H_
 
 #import <IOBluetooth/IOBluetooth.h>
 #import <IOKit/IOReturn.h>
 
@@ skipping 20 matching lines @@
   // if the open process was successfully started (or if an existing RFCOMM
   // channel was found). Otherwise, sets |status| to an error status.
   static scoped_ptr<BluetoothRfcommChannelMac> OpenAsync(
       BluetoothSocketMac* socket,
       IOBluetoothDevice* device,
       BluetoothRFCOMMChannelID channel_id,
       IOReturn* status);
 
   // BluetoothChannelMac:
   virtual void SetSocket(BluetoothSocketMac* socket) OVERRIDE;
-  virtual std::string GetDeviceAddress() OVERRIDE;
+  virtual IOBluetoothDevice* GetDevice() OVERRIDE;
   virtual uint16_t GetOutgoingMTU() OVERRIDE;
   virtual IOReturn WriteAsync(void* data,
                               uint16_t length,
                               void* refcon) OVERRIDE;
 
   void OnChannelOpenComplete(IOBluetoothRFCOMMChannel* channel,
                              IOReturn status);
   void OnChannelClosed(IOBluetoothRFCOMMChannel* channel);
   void OnChannelDataReceived(IOBluetoothRFCOMMChannel* channel,
                              void* data,
                              size_t length);
   void OnChannelWriteComplete(IOBluetoothRFCOMMChannel* channel,
                               void* refcon,
                               IOReturn status);
 
  private:
   // The wrapped native RFCOMM channel.
   base::scoped_nsobject<IOBluetoothRFCOMMChannel> channel_;
 
   // The delegate for the native channel.
   base::scoped_nsobject<BluetoothRfcommChannelDelegate> delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothRfcommChannelMac);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_RFCOMM_CHANNEL_MAC_H_