All WebRTC content browsertests will now force iSAC 16K on Android.

content/test/data/media/webrtc_test_audio.js

 // Copyright 2013 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.
 
 // Audio test utilities.
 
 // Gathers |numSamples| samples at |frequency| number of times per second and
 // calls back |callback| with an array with numbers in the [0, 32768] range.
 function gatherAudioLevelSamples(peerConnection, numSamples, frequency,
                                  callback) {
@@ skipping 22 matching lines @@
     largest = Math.max(largest, samples[i]);
 
   console.log('Average audio level: ' + average + ', largest: ' + largest);
 
   // TODO(phoglund): Make a more sophisticated curve-fitting algorithm. We want
   // to see a number of peaks with relative silence between them. The following
   // seems to work fine on a nexus 7.
   if (average < 3000 || average > 8000)
     throw 'Unexpected avg audio level: got ' + average + ', expected it ' +
           'to be 4000 < avg < 8000.'
-  if (largest < 30000)
+  if (largest < 25000)
     throw 'Too low max audio level: got ' + largest + ', expected > 30000.';
 };
 
 // If silent (like when muted), we should get very near zero audio level.
 function verifyIsSilent(samples) {
   var average = 0;
   for (var i = 0; i < samples.length; ++i)
     average += samples[i] / samples.length;
 
   console.log('Average audio level: ' + average);
@@ skipping 11 matching lines @@
     var report = reports[i];
     if (report.names().indexOf('audioOutputLevel') != -1) {
       audioOutputLevels.push(report.stat('audioOutputLevel'));
     }
   }
   // Should only be one audio level reported, otherwise we get confused.
   expectEquals(1, audioOutputLevels.length);
 
   return audioOutputLevels[0];
 }