Convert Oscillator tests to new Audit

third_party/WebKit/LayoutTests/webaudio/resources/late-start-testing.js

 function runLateStartTest(audit, context, node) {
 
   // Set up a dummy signal path to keep the audio context running and spend
   // processing time before calling start(0).
   var osc = context.createOscillator();
   var silent = context.createGain();
 
   osc.connect(silent);
   silent.connect(context.destination);
   silent.gain.setValueAtTime(0.0, 0);
   osc.start();
 
   node.connect(context.destination);
 
   // Task: schedule a suspend and start rendering.
-  audit.defineTask('test-late-start', function (done) {
+  audit.define('test-late-start', (task, should) => {
     // The node's start time will be clamped to the render quantum boundary
     // >0.1 sec. Thus the rendered buffer will have non-zero frames.
     // See issue: crbug.com/462167
     context.suspend(0.1).then(() => {
       node.start(0);
       context.resume();
     });
 
     // Start rendering and verify result: this verifies if 1) the rendered
     // buffer contains at least one non-zero value and 2) the non-zero value is
     // found later than the first output sample.
     context.startRendering().then(function (buffer) {
       var nonZeroValueIndex = -1;
       var channelData = buffer.getChannelData(0);
       for (var i = 0; i < channelData.length; i++) {
         if (channelData[i] !== 0) {
           nonZeroValueIndex = i;
           break;
         }
       }
 
-      var success =
-          Should('The index of first non-zero value',nonZeroValueIndex)
+      should(nonZeroValueIndex, 'The index of first non-zero value')
               .notBeEqualTo(-1);
-      success = Should('The first sample value', channelData[0])
-          .beEqualTo(0) && success;
-      Should('The rendered buffer', success)
-          .summarize('contains non-zero values after the first sample',
-                     'was all zeros or has non-zero first sample.');
-      done();
+      should(channelData[0], 'The first sample value')
+          .beEqualTo(0);
+      task.done();
     });
   });
 
-  audit.runTasks();
+  audit.run();
 }