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

chrome/common/extensions/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};
 
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     // possible device types. When in doubt you should use the |deviceClass|
     // field directly.
     DeviceType? type;
 
     // Indicates whether or not the device is paired with the system.
     boolean? paired;
 
     // Indicates whether the device is currently connected to the system.
     boolean? connected;
 
+    // Indicates the RSSI ("received signal strength indication") of the
+    // connection to the device, measured in dBm, to a resolution of 1dBm.
+    // If the device is currently connected, then measures the RSSI of the
+    // connection signal. Otherwise, measures the RSSI of the last inquiry sent
+    // to the device, where available. Absent if unavailable.
+    long? rssi;
+
+    // Indicates the host's current transmit power ("Tx power") for the
+    // connection to the device, measured in dBm, to a resolution of 1dBm.
+    // This value is only available if the device is currently connected.
+    long? currentHostTransmitPower;
+
+    // Indicates the host's maximum transmit power ("Tx power") for the
+    // connection to the device, measured in dBm, to a resolution of 1dBm.
+    // This value is only available if the device is currently connected.
+    long? maximumHostTransmitPower;
+
     // 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;
   };
 
   // Information about a Bluetooth profile.
   dictionary Profile {
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     static void onReceive(ReceiveInfo info);
 
     // Event raised when a network error occured while the runtime was waiting
     // for data on the socket. Once this event is raised, the socket is set to
     // <code>paused</code> and no more <code>onReceive</code> events are raised
     // for this socket.
     // |info| : The event data.
     static void onReceiveError(ReceiveErrorInfo info);
   };
 };