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

third_party/WebKit/LayoutTests/fast/canvas/canvas-getImageData.html

-This test ensures that getImageData works correctly.
-<div id="log"></div>
+<script src="../../resources/testharness.js"></script>
+<script src="../../resources/testharnessreport.js"></script>
+
 <script>
-if (window.testRunner)
-    testRunner.dumpAsText();
 
 var canvas = document.createElement("canvas");
 canvas.width = 200;
 canvas.height = 200;
 var context = canvas.getContext("2d");
 
-function log(msg){
-    document.getElementById("log").innerHTML += msg + "<br/>";
-}
-
 function dataToArray(data) {
     var result = new Array(data.length)
     for (var i = 0; i < data.length; i++)
         result[i] = data[i];
     return result;
 }
 
 function getPixel(ctx, x, y) {
     var data = ctx.getImageData(x,y,1,1);
-    if (!data) // getImageData failed, which should never happen
-        return [-1,-1,-1,-1];
+    assert_not_equals(data, null);
     return dataToArray(data.data);
 }
 
 function pixelShouldBe(ctx, x, y, colour) {
     var ctxColour = getPixel(ctx, x, y);
-    var correct = true;
     for (var i = 0; i < 4; i++)
-        if (colour[i] != ctxColour[i]) {
-            correct = false;
-            break;
-        }
-    if (correct)
-        log("PASS: pixel at ("+[x,y]+") was ["+colour+"]");
-    else
-        log("FAIL: pixel at ("+[x,y]+") was ["+ctxColour+"], expected ["+colour+"]");
+        assert_equals(colour[i], ctxColour[i]);
 }
 
+test(function(t) {
+
 if (!context.setFillColor)

[Justin Novosad, 2017/02/03 18:07:18]

indent

     context.setFillColor = function(r,g,b,a) {
-        this.fillStyle = "rgba("+[Math.round(r*255),Math.round(g*255),Math.round(b*255),Math.round(a*255)]+")"
+        this.fillStyle = "rgba("+[Math.round(r*255),Math.round(g*255),Math.round(b*255),Math.round(a*255)]+")";
     }
 
 // Check that getImageData is return the data for the right portion of the image
-for(var x = 0; x < 100; x+=4) {
+for(var x = 0; x < 100; x += 4) {
     context.setFillColor(0, x/96, 0, 1);
-    context.fillRect(x,0,1,1);
+    context.fillRect(x, 0, 1, 1);
     pixelShouldBe(context, x, 0, [0, Math.round(255*x/96), 0, 255]);
 }
 
 // Check rgba ordering
-context.clearRect(0,0,100,100);
+context.clearRect(0, 0, 100, 100);
 context.setFillColor(0.25, 0.5, 0.75, 1);
-context.fillRect(5,5,1,1);
+context.fillRect(5, 5, 1, 1);
 pixelShouldBe(context, 5, 5, [Math.round(0.25*255), Math.round(0.5*255), Math.round(0.75*255), 255]);
 
 // Make sure we return correct values for the row
 for (var i = 0; i < 100; i++) {
     context.fillStyle = "rgba("+[0, i, 0, 1]+")";
     context.fillRect(i, 10, 1, 1);
 }
 
 var rowImageData = context.getImageData(0, 10, 100, 1).data;
 var rowCheck = true;
 for (var i = 0; i < 100; i++) {
     if (rowImageData[i * 4 + 1] != i) {
         rowCheck = false;
         break;
     }
 }
-if (!rowCheck)
-    log("FAIL: Did not correctly retrieve every pixel in a row");
-else
-    log("PASS: Correctly retrieved every pixel in a row");
+assert_true(rowCheck);
 
 // Check that we return transparent black for regions outside the canvas proper
 context.fillStyle = "rgba(255,255,255,255)";
 context.fillRect(198, 5, 4, 1); // final 2 pixels horizontally should be clipped
 var content = dataToArray(context.getImageData(198, 5, 4, 1).data);
 var expected = [255,255,255,255,255,255,255,255,
                 0,0,0,0,0,0,0,0];
-var matched = true;
 for (var i = 0; i < 16; i++)
-    if (content[i] != expected[i]) {
-        matched = false;
-        break;
-    }
-if (matched)
-    log("PASS: Correct data for content outside canvas bounds");
-else
-    log("FAIL: Did not get correct data for content outside canvas bounds: "+content);
+    assert_equals(content[i], expected[i]);
 
+}, 'This test ensures that getImageData works correctly.');
 </script>