Expose device RSSI and Tx power via the chrome.bluetooth API.

device/bluetooth/bluetooth_device_mac.mm

 // Copyright 2013 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.
 
 #include "device/bluetooth/bluetooth_device_mac.h"
 
 #include <IOBluetooth/Bluetooth.h>
 #import <IOBluetooth/objc/IOBluetoothDevice.h>
 #import <IOBluetooth/objc/IOBluetoothSDPServiceRecord.h>
 #import <IOBluetooth/objc/IOBluetoothSDPUUID.h>
@@ skipping 66 matching lines @@
 }
 
 uint16 BluetoothDeviceMac::GetProductID() const {
   return 0;
 }
 
 uint16 BluetoothDeviceMac::GetDeviceID() const {
   return 0;
 }
 
+int BluetoothDeviceMac::GetRSSI() const {
+  return [device_ rawRSSI];
+}
+
 bool BluetoothDeviceMac::IsPaired() const {
   return [device_ isPaired];
 }
 
 bool BluetoothDeviceMac::IsConnected() const {
   return [device_ isConnected];
 }
 
 bool BluetoothDeviceMac::IsConnectable() const {
   return false;
@@ skipping 80 matching lines @@
   NOTIMPLEMENTED();
 }
 
 void BluetoothDeviceMac::ClearOutOfBandPairingData(
     const base::Closure& callback,
     const ErrorCallback& error_callback) {
   NOTIMPLEMENTED();
 }
 
 }  // namespace device