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

third_party/WebKit/LayoutTests/fast/canvas/canvas-toDataURL-webp.html

 <!-- The letters in the right image should be blurry compared to the letters in the left image. -->
 <canvas></canvas>
 <img id="result">
 <pre id="error"></pre>
 
 <script>
 if (window.testRunner) {
     window.testRunner.dumpAsTextWithPixelResults();

[Justin Novosad, 2017/02/15 20:02:28]

You missed this test.

[zakerinasab, 2017/02/16 17:32:07]

This is not a js-test.js based layout test. We have a bunch of these tests that
rely on the visual properties of the output (like this one) and do not check the
pixel values. For now I ignore these tests, but I think we need to address these
later. I removed this one from the CL for now.

     window.testRunner.waitUntilDone();
 }
 
 var image = new Image();
 
 image.onload = function() {
     var canvas = document.querySelector('canvas');
     canvas.width = this.width;
     canvas.height = this.height;
     canvas.getContext('2d').drawImage(this, 0, 0);
 
     var dataURL = canvas.toDataURL('image/webp', 0.3); // low quality
 
-    if (!dataURL.match(/^data:image\/webp[;,]/))
+    if (!dataURL.match(/^data:image\/webp[;, ]/))

[Justin Novosad, 2017/02/15 20:02:28]

why?

[zakerinasab, 2017/02/16 17:32:07]

Because this is an image/webp data url?

         error.textContent += "FAIL: the dataURL should have 'image/webp' type.";
     else
         result.src = dataURL;
 
     document.body.style.zoom = 1.3; // zoom in to see the low quality
 
     if (window.testRunner)
         window.testRunner.notifyDone();
 };
 
 image.src = "resources/letters.png";
 </script>