Expose TxPower for bluetooth devices during discovery

device/bluetooth/bluetooth_low_energy_device_mac.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 DEVICE_BLUETOOTH_BLUETOOTH_LOW_ENERGY_DEVICE_MAC_H_
 #define DEVICE_BLUETOOTH_BLUETOOTH_LOW_ENERGY_DEVICE_MAC_H_
 
 #if defined(OS_IOS)
 #import <CoreBluetooth/CoreBluetooth.h>
 #else
@@ skipping 24 matching lines @@
   BluetoothDevice::VendorIDSource GetVendorIDSource() const override;
   uint16 GetVendorID() const override;
   uint16 GetProductID() const override;
   uint16 GetDeviceID() const override;
   bool IsPaired() const override;
   bool IsConnected() const override;
   bool IsConnectable() const override;
   bool IsConnecting() const override;
   BluetoothDevice::UUIDList GetUUIDs() const override;
   int16 GetInquiryRSSI() const override;
+  int16 GetInquiryTxPower() const override;
   bool ExpectingPinCode() const override;
   bool ExpectingPasskey() const override;
   bool ExpectingConfirmation() const override;
   void GetConnectionInfo(const ConnectionInfoCallback& callback) override;
   void Connect(PairingDelegate* pairing_delegate,
                const base::Closure& callback,
                const ConnectErrorCallback& error_callback) override;
   void SetPinCode(const std::string& pincode) override;
   void SetPasskey(uint32 passkey) override;
   void ConfirmPairing() override;
@@ skipping 36 matching lines @@
 
   // Whether the device is connectable.
   bool connectable_;
 
   DISALLOW_COPY_AND_ASSIGN(BluetoothLowEnergyDeviceMac);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_BLUETOOTH_BLUETOOTH_LOW_ENERGY_DEVICE_MAC_H_