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

third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/the-canvas-state/2d.state.saverestore.globalAlpha.worker.js

Index: third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/the-canvas-state/2d.state.saverestore.globalAlpha.worker.js
diff --git a/third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/the-canvas-state/2d.state.saverestore.globalAlpha.worker.js b/third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/the-canvas-state/2d.state.saverestore.globalAlpha.worker.js
deleted file mode 100644
index 6432783c7dc0cb349f6f4257045f990d6b982379..0000000000000000000000000000000000000000
--- a/third_party/WebKit/LayoutTests/imported/wpt/offscreen-canvas/the-canvas-state/2d.state.saverestore.globalAlpha.worker.js
+++ /dev/null
@@ -1,34 +0,0 @@
-// DO NOT EDIT! This test has been generated by tools/gentest.py.
-// OffscreenCanvas test in a worker:2d.state.saverestore.globalAlpha
-// Description:save()/restore() works for globalAlpha
-// Note:
-
-importScripts("/resources/testharness.js");
-importScripts("/common/canvas-tests.js");
-
-var t = async_test("save()/restore() works for globalAlpha");
-t.step(function() {
-
-var offscreenCanvas = new OffscreenCanvas(100, 50);
-var ctx = offscreenCanvas.getContext('2d');
-
-// Test that restore() undoes any modifications
-var old = ctx.globalAlpha;
-ctx.save();
-ctx.globalAlpha = 0.5;
-ctx.restore();
-_assertSame(ctx.globalAlpha, old, "ctx.globalAlpha", "old");
-
-// Also test that save() doesn't modify the values
-ctx.globalAlpha = 0.5;
-old = ctx.globalAlpha;
-    // we're not interested in failures caused by get(set(x)) != x (e.g.
-    // from rounding), so compare against 'old' instead of against 0.5
-ctx.save();
-_assertSame(ctx.globalAlpha, old, "ctx.globalAlpha", "old");
-ctx.restore();
-
-t.done();
-
-});
-done();