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

third_party/WebKit/LayoutTests/fast/canvas/canvas-pattern-modify.js

-// Based on http://philip.html5.org/tests/canvas/suite/tests/2d.pattern.modify.canvas1.html
-
-description("This test checks if pattern changes after the source canvas is modified. See https://bugs.webkit.org/show_bug.cgi?id=20578 .");
-
-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];
-    return dataToArray(data.data);
-}
-
-function pixelShouldBe(ctx, x, y, colour) {
-    shouldBe("getPixel(ctx, " + [x, y] +")", "["+colour+"]");
-}
-
-function createCanvasImage(width, height, colour) {
-    var c = document.createElement("canvas");
-    c.width = width;
-    c.height = height;
-    var context = c.getContext("2d");
-    context.fillStyle = colour;
-    context.fillRect(0,0,width,height);
-    return c;
-}
-
-var canvas = createCanvasImage(100, 50, '#fff');
-var ctx = canvas.getContext('2d');
-
-var patternCanvas = createCanvasImage(100, 50, '#0f0');
-var pattern = ctx.createPattern(patternCanvas, 'no-repeat');
-
-// Modify the original canvas after we create a pattern.
-var patternCtx = patternCanvas.getContext('2d');
-patternCtx.fillStyle = '#f00';
-patternCtx.fillRect(0, 0, 100, 50);
-
-ctx.fillStyle = pattern;
-ctx.fillRect(0, 0, 100, 50);
-
-pixelShouldBe(ctx, 1, 1, [0, 255, 0, 255]);
-pixelShouldBe(ctx, 98, 1, [0, 255, 0, 255]);
-pixelShouldBe(ctx, 1, 48, [0, 255, 0, 255]);
-pixelShouldBe(ctx, 98, 48, [0, 255, 0, 255]);