Add offscreen-canvas to the list of wpt directories to skip.

third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/line-styles/2d.line.cap.butt.worker.js

-// DO NOT EDIT! This test has been generated by tools/gentest.py.
-// OffscreenCanvas test in a worker:2d.line.cap.butt
-// Description:lineCap 'butt' is rendered correctly
-// Note:
-
-importScripts("/resources/testharness.js");
-importScripts("/common/canvas-tests.js");
-
-var t = async_test("lineCap 'butt' is rendered correctly");
-t.step(function() {
-
-var offscreenCanvas = new OffscreenCanvas(100, 50);
-var ctx = offscreenCanvas.getContext('2d');
-
-ctx.fillStyle = '#0f0';
-ctx.fillRect(0, 0, 100, 50);
-ctx.lineCap = 'butt';
-ctx.lineWidth = 20;
-ctx.fillStyle = '#f00';
-ctx.strokeStyle = '#0f0';
-ctx.fillRect(15, 15, 20, 20);
-ctx.beginPath();
-ctx.moveTo(25, 15);
-ctx.lineTo(25, 35);
-ctx.stroke();
-ctx.fillStyle = '#0f0';
-ctx.strokeStyle = '#f00';
-ctx.beginPath();
-ctx.moveTo(75, 15);
-ctx.lineTo(75, 35);
-ctx.stroke();
-ctx.fillRect(65, 15, 20, 20);
-_assertPixel(offscreenCanvas, 25,14, 0,255,0,255, "25,14", "0,255,0,255");
-_assertPixel(offscreenCanvas, 25,15, 0,255,0,255, "25,15", "0,255,0,255");
-_assertPixel(offscreenCanvas, 25,16, 0,255,0,255, "25,16", "0,255,0,255");
-_assertPixel(offscreenCanvas, 25,34, 0,255,0,255, "25,34", "0,255,0,255");
-_assertPixel(offscreenCanvas, 25,35, 0,255,0,255, "25,35", "0,255,0,255");
-_assertPixel(offscreenCanvas, 25,36, 0,255,0,255, "25,36", "0,255,0,255");
-_assertPixel(offscreenCanvas, 75,14, 0,255,0,255, "75,14", "0,255,0,255");
-_assertPixel(offscreenCanvas, 75,15, 0,255,0,255, "75,15", "0,255,0,255");
-_assertPixel(offscreenCanvas, 75,16, 0,255,0,255, "75,16", "0,255,0,255");
-_assertPixel(offscreenCanvas, 75,34, 0,255,0,255, "75,34", "0,255,0,255");
-_assertPixel(offscreenCanvas, 75,35, 0,255,0,255, "75,35", "0,255,0,255");
-_assertPixel(offscreenCanvas, 75,36, 0,255,0,255, "75,36", "0,255,0,255");
-
-t.done();
-
-});
-done();