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

third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/fill-and-stroke-styles/2d.gradient.radial.inside2.worker.js

-// DO NOT EDIT! This test has been generated by tools/gentest.py.
-// OffscreenCanvas test in a worker:2d.gradient.radial.inside2
-// Description:
-// Note:
-
-importScripts("/resources/testharness.js");
-importScripts("/common/canvas-tests.js");
-
-var t = async_test("");
-t.step(function() {
-
-var offscreenCanvas = new OffscreenCanvas(100, 50);
-var ctx = offscreenCanvas.getContext('2d');
-
-ctx.fillStyle = '#f00';
-ctx.fillRect(0, 0, 100, 50);
-var g = ctx.createRadialGradient(50, 25, 200, 50, 25, 100);
-g.addColorStop(0, '#f00');
-g.addColorStop(1, '#0f0');
-ctx.fillStyle = g;
-ctx.fillRect(0, 0, 100, 50);
-_assertPixel(offscreenCanvas, 1,1, 0,255,0,255, "1,1", "0,255,0,255");
-_assertPixel(offscreenCanvas, 50,1, 0,255,0,255, "50,1", "0,255,0,255");
-_assertPixel(offscreenCanvas, 98,1, 0,255,0,255, "98,1", "0,255,0,255");
-_assertPixel(offscreenCanvas, 1,25, 0,255,0,255, "1,25", "0,255,0,255");
-_assertPixel(offscreenCanvas, 50,25, 0,255,0,255, "50,25", "0,255,0,255");
-_assertPixel(offscreenCanvas, 98,25, 0,255,0,255, "98,25", "0,255,0,255");
-_assertPixel(offscreenCanvas, 1,48, 0,255,0,255, "1,48", "0,255,0,255");
-_assertPixel(offscreenCanvas, 50,48, 0,255,0,255, "50,48", "0,255,0,255");
-_assertPixel(offscreenCanvas, 98,48, 0,255,0,255, "98,48", "0,255,0,255");
-
-t.done();
-
-});
-done();