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

third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/path-objects/2d.path.arc.angle.2.worker.js

Index: third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/path-objects/2d.path.arc.angle.2.worker.js
diff --git a/third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/path-objects/2d.path.arc.angle.2.worker.js b/third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/path-objects/2d.path.arc.angle.2.worker.js
deleted file mode 100644
index 7a7def978a6a43d311879b6fcd0dc8fc35f6cede..0000000000000000000000000000000000000000
--- a/third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/path-objects/2d.path.arc.angle.2.worker.js
+++ /dev/null
@@ -1,27 +0,0 @@
-// DO NOT EDIT! This test has been generated by tools/gentest.py.
-// OffscreenCanvas test in a worker:2d.path.arc.angle.2
-// Description:arc() draws -3pi/2 .. -pi anticlockwise correctly
-// Note:
-
-importScripts("/resources/testharness.js");
-importScripts("/common/canvas-tests.js");
-
-var t = async_test("arc() draws -3pi/2 .. -pi anticlockwise 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.fillStyle = '#f00';
-ctx.beginPath();
-ctx.moveTo(100, 0);
-ctx.arc(100, 0, 150, -3*Math.PI/2, -Math.PI, true);
-ctx.fill();
-_assertPixel(offscreenCanvas, 50,25, 0,255,0,255, "50,25", "0,255,0,255");
-
-t.done();
-
-});
-done();