Improve audible token detection.

chrome/common/extensions/api/copresence_private.idl

Index: chrome/common/extensions/api/copresence_private.idl
diff --git a/chrome/common/extensions/api/copresence_private.idl b/chrome/common/extensions/api/copresence_private.idl
index 1715703db1530ea55e124dff1891798f907be31a..9b0e12df2ab5450c47e83b98ffeab88ba7f48d66 100644
--- a/chrome/common/extensions/api/copresence_private.idl
+++ b/chrome/common/extensions/api/copresence_private.idl
@@ -25,13 +25,18 @@ namespace copresencePrivate {
     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);
   };