Expose TxPower for bluetooth devices during discovery

device/bluetooth/test/mock_bluetooth_device.h

Index: device/bluetooth/test/mock_bluetooth_device.h
diff --git a/device/bluetooth/test/mock_bluetooth_device.h b/device/bluetooth/test/mock_bluetooth_device.h
index cedf402872e475e0499ea8f752ac8543c40a281c..039c8cec2b17e536ab5ef15e79c77bf720a826b5 100644
--- a/device/bluetooth/test/mock_bluetooth_device.h
+++ b/device/bluetooth/test/mock_bluetooth_device.h
@@ -41,6 +41,7 @@ class MockBluetoothDevice : public BluetoothDevice {
   MOCK_CONST_METHOD0(IsConnecting, bool());
   MOCK_CONST_METHOD0(GetUUIDs, UUIDList());
   MOCK_CONST_METHOD0(GetInquiryRSSI, int16());
+  MOCK_CONST_METHOD0(GetInquiryTxPower, int16());
   MOCK_CONST_METHOD0(ExpectingPinCode, bool());
   MOCK_CONST_METHOD0(ExpectingPasskey, bool());
   MOCK_CONST_METHOD0(ExpectingConfirmation, bool());