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

third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/compositing/2d.composite.uncovered.nocontext.source-in.worker.js

Index: third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/compositing/2d.composite.uncovered.nocontext.source-in.worker.js
diff --git a/third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/compositing/2d.composite.uncovered.nocontext.source-in.worker.js b/third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/compositing/2d.composite.uncovered.nocontext.source-in.worker.js
deleted file mode 100644
index cca1b1bd3458aa6238aae06161bd9cdbccf3b19e..0000000000000000000000000000000000000000
--- a/third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/compositing/2d.composite.uncovered.nocontext.source-in.worker.js
+++ /dev/null
@@ -1,26 +0,0 @@
-// DO NOT EDIT! This test has been generated by tools/gentest.py.
-// OffscreenCanvas test in a worker:2d.composite.uncovered.nocontext.source-in
-// Description:drawImage() of a canvas with no context draws pixels as (0,0,0,0), and does not leave the pixels unchanged.
-// Note:
-
-importScripts("/resources/testharness.js");
-importScripts("/common/canvas-tests.js");
-
-var t = async_test("drawImage() of a canvas with no context draws pixels as (0,0,0,0), and does not leave the pixels unchanged.");
-t.step(function() {
-
-var offscreenCanvas = new OffscreenCanvas(100, 50);
-var ctx = offscreenCanvas.getContext('2d');
-
-
-ctx.fillStyle = 'rgba(0, 255, 255, 0.5)';
-ctx.fillRect(0, 0, 100, 50);
-ctx.globalCompositeOperation = 'source-in';
-var offscreenCanvas2 = new OffscreenCanvas(100, 50);
-ctx.drawImage(offscreenCanvas2, 0, 0);
-_assertPixelApprox(offscreenCanvas, 50,25, 0,0,0,0, "50,25", "0,0,0,0", 5);
-
-t.done();
-
-});
-done();