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

third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/the-offscreen-canvas/initial.reset.gradient.worker.js

-// DO NOT EDIT! This test has been generated by tools/gentest.py.
-// OffscreenCanvas test in a worker:initial.reset.gradient
-// Description:Resetting the canvas state does not invalidate any existing gradients
-// Note:
-
-importScripts("/resources/testharness.js");
-importScripts("/common/canvas-tests.js");
-
-var t = async_test("Resetting the canvas state does not invalidate any existing gradients");
-t.step(function() {
-
-var offscreenCanvas = new OffscreenCanvas(100, 50);
-var ctx = offscreenCanvas.getContext('2d');
-
-offscreenCanvas2.width = 50;
-var g = ctx.createLinearGradient(0, 0, 100, 0);
-g.addColorStop(0, '#0f0');
-g.addColorStop(1, '#0f0');
-offscreenCanvas2.width = 100;
-ctx.fillStyle = '#f00';
-ctx.fillRect(0, 0, 100, 50);
-ctx.fillStyle = g;
-ctx.fillRect(0, 0, 100, 50);
-_assertPixel(offscreenCanvas, 50,25, 0,255,0,255, "50,25", "0,255,0,255");
-
-t.done();
-
-});
-done();