Use testharness.js instead of js-test.js in LayoutTests/fast/canvas tests.

third_party/WebKit/LayoutTests/fast/canvas/canvas-toBlob-toDataURL-race-imageEncoder-png.html

-<script src = "../../resources/js-test.js"></script>
-<script src = "../../fast/canvas/script-tests/canvas-toBlob-toDataURL-race.js"></script>
-<script type = 'text/javascript'>
-description("Verifies if synchronous PNG image encoding (toDataURL) conflicts with asynchronous image encoding (toBlob)");
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+<script src = "./script-tests/canvas-toBlob-toDataURL-race.js"></script>
 
-//Fire a bunch of toBlob operations of canvas to keep the async thread busy
-var j = 0; // due to async nature of toBlob we need a separate counter
-for (var i = 0; i < numToBlobCalls; i++) 
-{
-    canvas.toBlob(function(blob) {
-        url = URL.createObjectURL(blob);
-        testImages[j++].src = url;
-    });
-}
+<script>
+async_test(function(t) {
 
-//Then file a bunch of toDataURL operation on main thread, so both threads now compete for image encoding
-for (var i = numToBlobCalls; i < (numToDataURLCalls + numToBlobCalls); i++) 
-{
-    testImages[i].src = canvas.toDataURL();
-}
+    createAllTestCases(t);
+
+    //Fire a bunch of toBlob operations of canvas to keep the async thread busy
+    var j = 0; // due to async nature of toBlob we need a separate counter
+    for (var i = 0; i < numToBlobCalls; i++) 
+    {
+        canvas.toBlob(function(blob) {
+            url = URL.createObjectURL(blob);
+            testImages[j++].src = url;
+        });
+    }
+    
+    //Then file a bunch of toDataURL operation on main thread, so both threads now compete for image encoding
+    for (var i = numToBlobCalls; i < (numToDataURLCalls + numToBlobCalls); i++) 
+    {
+        testImages[i].src = canvas.toDataURL();
+    }
+    
+}, "Verifies if synchronous PNG image encoding (toDataURL) conflicts with asynchronous image encoding (toBlob)");
 </script>