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

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

Index: third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/line-styles/2d.line.union.worker.js
diff --git a/third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/line-styles/2d.line.union.worker.js b/third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/line-styles/2d.line.union.worker.js
deleted file mode 100644
index e2c66689b84ac4c12a462313f23c40b256f83524..0000000000000000000000000000000000000000
--- a/third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/line-styles/2d.line.union.worker.js
+++ /dev/null
@@ -1,36 +0,0 @@
-// DO NOT EDIT! This test has been generated by tools/gentest.py.
-// OffscreenCanvas test in a worker:2d.line.union
-// 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);
-ctx.lineWidth = 100;
-ctx.lineCap = 'round';
-ctx.strokeStyle = '#0f0';
-ctx.beginPath();
-ctx.moveTo(0, 24);
-ctx.lineTo(100, 25);
-ctx.lineTo(0, 26);
-ctx.closePath();
-ctx.stroke();
-_assertPixel(offscreenCanvas, 1,1, 0,255,0,255, "1,1", "0,255,0,255");
-_assertPixel(offscreenCanvas, 25,1, 0,255,0,255, "25,1", "0,255,0,255");
-_assertPixel(offscreenCanvas, 48,1, 0,255,0,255, "48,1", "0,255,0,255");
-_assertPixel(offscreenCanvas, 1,48, 0,255,0,255, "1,48", "0,255,0,255");
-_assertPixel(offscreenCanvas, 25,1, 0,255,0,255, "25,1", "0,255,0,255");
-_assertPixel(offscreenCanvas, 48,48, 0,255,0,255, "48,48", "0,255,0,255");
-
-t.done();
-
-});
-done();