Expose TxPower for bluetooth devices during discovery

extensions/common/api/bluetooth.idl

 // 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.
 
 // Use the <code>chrome.bluetooth</code> API to connect to a Bluetooth
 // device. All functions report failures via chrome.runtime.lastError.
 namespace bluetooth {
   // Allocation authorities for Vendor IDs.
   enum VendorIdSource {bluetooth, usb};
 
@@ skipping 57 matching lines @@
     // UUIDs of protocols, profiles and services advertised by the device.
     // For classic Bluetooth devices, this list is obtained from EIR data and
     // SDP tables. For Low Energy devices, this list is obtained from AD and
     // GATT primary services. For dual mode devices this may be obtained from
     // both.
     DOMString[]? uuids;
 
     // The received signal strength, in dBm. This field is avaliable and valid
     // only during discovery. Outside of discovery it's value is not specified.
     long? inquiryRssi;
+  
+    // The transmitted power level. This field is avaliable only for LE devices
+    // that include this field in AD. It is avaliable and valid only during
+    // discovery.
+    long? inquiryTxPower;
   };
 
   // Callback from the <code>getDevice</code> method.
   // |deviceInfo| : Object containing the device information.
   callback GetDeviceCallback = void(Device deviceInfo);
 
   // Callback from the <code>getDevices</code> method.
   // |deviceInfos| : Array of object containing device information.
   callback GetDevicesCallback = void(Device[] deviceInfos);
 
@@ skipping 46 matching lines @@
 
     // Fired when information about a known Bluetooth device has changed.
     static void onDeviceChanged(Device device);
 
     // Fired when a Bluetooth device that was previously discovered has been
     // out of range for long enough to be considered unavailable again, and
     // when a paired device is removed.
     static void onDeviceRemoved(Device device);
   };
 };