Convert Oscillator Audit tests to testharness

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

Index: third_party/WebKit/LayoutTests/webaudio/resources/late-start-testing.js
diff --git a/third_party/WebKit/LayoutTests/webaudio/resources/late-start-testing.js b/third_party/WebKit/LayoutTests/webaudio/resources/late-start-testing.js
index 96f709b1285e757504e96ddeddc592f981fa00bf..ece2af3b9150e59716c65e38d3f9434063b54ff2 100644
--- a/third_party/WebKit/LayoutTests/webaudio/resources/late-start-testing.js
+++ b/third_party/WebKit/LayoutTests/webaudio/resources/late-start-testing.js
@@ -44,26 +44,19 @@ function runLateStartTest(audit, context, node) {
         }
       }
 
-      if (nonZeroValueIndex === -1) {
-        testFailed('The rendered buffer was all zeros.');
-      } else if (nonZeroValueIndex === 0) {
-        testFailed('The first sample was non-zero value. It should be zero.');
-      } else {
-        testPassed('The rendered buffer contains non-zero values after the first sample.');
-      }
+      Should("The rendered buffer should not be all zeroes",
+             nonZeroValueIndex !== -1)
+          .beEqualTo(true);
+      Should("The first sample",
+             channelData[0])
+          .beEqualTo(0);
+      Should("The rendered buffer contains non-zero values after the first sample",
+             nonZeroValueIndex > 0)
+          .beEqualTo(true);
 
       done();
     });
   });
 
-  audit.defineTask('finish-test', function (done) {
-    done();
-    finishJSTest();
-  });
-
-  audit.runTasks(
-    'test-late-start',
-    'finish-test'
-  );
-
-}
+  audit.runTasks();
+}