Improve audible token detection.

chrome/common/extensions/api/copresence_private.idl

 // Copyright 2014 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.copresencePrivate</code> API to interface with Chrome
 // from the whispernet_proxy extension.
 namespace copresencePrivate {
 
   dictionary PlayParameters {
     double sampleRate;
     long bitsPerSample;
     double carrierFrequency;
     long repetitions;
   };
 
   dictionary RecordParameters {
     double sampleRate;
     long bitsPerSample;
     long channels;
     double carrierFrequency;
   };
 
   dictionary AudioParameters {
     PlayParameters play;
     RecordParameters record;
   };
 
+  dictionary Token {
+    DOMString token;
+    boolean audible;
+  };
+
   interface Functions {
     // Send a boolean indicating whether our initialization was successful.
     static void sendInitialized(boolean success);
     // Sends an array of found tokens to Chrome.
-    static void sendFound(DOMString[] tokens);
+    static void sendFound(Token[] tokens);
     // Send an array buffer of samples encoded for the specified token.
-    static void sendSamples(DOMString token, ArrayBuffer samples);
+    static void sendSamples(Token token, ArrayBuffer samples);
     // Send a boolean indicating whether we detected a broadcast or not.
     static void sendDetect(boolean detected);
   };
 
   interface Events {
     // Fired to request initialization of the whisper.net library.
     static void onInitialize(AudioParameters audioParams);
     // Fired to request encoding of the given token.
     static void onEncodeTokenRequest(DOMString base64Token, boolean audible);
     // Fired when we have new samples to decode.
     static void onDecodeSamplesRequest(ArrayBuffer audioSamples);
     // Fired to request a DetectBroadcast.
     static void onDetectBroadcastRequest();
   };
 };