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

third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/pixel-manipulation/2d.imageData.object.round.worker.js

-// DO NOT EDIT! This test has been generated by tools/gentest.py.
-// OffscreenCanvas test in a worker:2d.imageData.object.round
-// Description:ImageData.data rounds numbers with round-to-zero
-// Note:
-
-importScripts("/resources/testharness.js");
-importScripts("/common/canvas-tests.js");
-
-var t = async_test("ImageData.data rounds numbers with round-to-zero");
-t.step(function() {
-
-var offscreenCanvas = new OffscreenCanvas(100, 50);
-var ctx = offscreenCanvas.getContext('2d');
-
-var imgdata = ctx.getImageData(0, 0, 10, 10);
-imgdata.data[0] = 0.499;
-_assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0");
-imgdata.data[0] = 0.5;
-_assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0");
-imgdata.data[0] = 0.501;
-_assertSame(imgdata.data[0], 1, "imgdata.data[\""+(0)+"\"]", "1");
-imgdata.data[0] = 1.499;
-_assertSame(imgdata.data[0], 1, "imgdata.data[\""+(0)+"\"]", "1");
-imgdata.data[0] = 1.5;
-_assertSame(imgdata.data[0], 2, "imgdata.data[\""+(0)+"\"]", "2");
-imgdata.data[0] = 1.501;
-_assertSame(imgdata.data[0], 2, "imgdata.data[\""+(0)+"\"]", "2");
-imgdata.data[0] = 2.5;
-_assertSame(imgdata.data[0], 2, "imgdata.data[\""+(0)+"\"]", "2");
-imgdata.data[0] = 3.5;
-_assertSame(imgdata.data[0], 4, "imgdata.data[\""+(0)+"\"]", "4");
-imgdata.data[0] = 252.5;
-_assertSame(imgdata.data[0], 252, "imgdata.data[\""+(0)+"\"]", "252");
-imgdata.data[0] = 253.5;
-_assertSame(imgdata.data[0], 254, "imgdata.data[\""+(0)+"\"]", "254");
-imgdata.data[0] = 254.5;
-_assertSame(imgdata.data[0], 254, "imgdata.data[\""+(0)+"\"]", "254");
-imgdata.data[0] = 256.5;
-_assertSame(imgdata.data[0], 255, "imgdata.data[\""+(0)+"\"]", "255");
-imgdata.data[0] = -0.5;
-_assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0");
-imgdata.data[0] = -1.5;
-_assertSame(imgdata.data[0], 0, "imgdata.data[\""+(0)+"\"]", "0");
-
-t.done();
-
-});
-done();