Reland of Allow canvases to be GPU-accelerated in Workers

third_party/WebKit/LayoutTests/TestExpectations

 # ====== Oilpan-only failures from here ======
 # Most of these actually cause the tests to report success, rather than
 # failure. Expected outputs will be adjusted for the better once Oilpan
 # has been well and truly enabled always.
 
 crbug.com/420008 inspector/tracing/worker-js-frames.html [ Pass Timeout Failure ]
 crbug.com/420008 virtual/threaded/inspector/tracing/worker-js-frames.html [ Pass Timeout Failure ]
 crbug.com/597572 [ Debug ] http/tests/inspector/resource-tree/resource-tree-reload.html [ Pass Failure ]
 
 crbug.com/569901 crbug.com/24182 [ Debug ] jquery/manipulation.html [ Timeout Pass ]
@@ skipping 129 matching lines @@
 crbug.com/563265 editing/spelling/context-menu-suggestions.html [ Skip ]
 crbug.com/563265 editing/spelling/spellcheck-editable-on-focus-multiframe.html [ Skip ]
 crbug.com/563265 editing/spelling/spellcheck-editable-on-focus-sync.html [ Skip ]
 crbug.com/563265 editing/spelling/spelling-unified-emulation.html [ Skip ]
 
 crbug.com/538697 [ Win7 Debug ] virtual/threaded/printing/webgl-oversized-printing.html [ Failure Crash ]
 crbug.com/538697 [ Win7 Debug ] printing/webgl-oversized-printing.html [ Failure Crash ]
 
 crbug.com/617152 imported/wpt/mediacapture-streams/GUM-impossible-constraint.https.html [ Skip ]
 
-# Expected to fail until OffscreenCanvas can render on the gpu
-crbug.com/593514 virtual/gpu/fast/canvas/OffscreenCanvas-strokeRect-in-worker.html [ Failure ]
-crbug.com/593514 virtual/gpu/fast/canvas/OffscreenCanvas-paths-in-worker.html [ Failure ]
-crbug.com/593514 virtual/gpu/fast/canvas/OffscreenCanvas-transform-shadow-in-worker.html [ Failure ]
-crbug.com/593514 virtual/gpu/fast/canvas/OffscreenCanvas-2d-gradients-in-worker.html [ Failure ]
-crbug.com/593514 virtual/gpu/fast/canvas/OffscreenCanvas-2d-drawImage-in-worker.html [ Failure ]
-crbug.com/593514 virtual/gpu/fast/canvas/OffscreenCanvas-2d-imageSmoothing-in-worker.html [ Failure ]
+crbug.com/644433 virtual/gpu/fast/canvas/OffscreenCanvas-2d-pattern-in-worker.html [ Failure ]
 
 crbug.com/417782 [ Linux Win ] virtual/rootlayerscrolls/fast/scrolling/fractional-scroll-offset-fixed-position-non-composited.html [ Failure ]
 crbug.com/492664 [ Linux ] imported/csswg-test/css-writing-modes-3/box-offsets-rel-pos-vlr-005.xht [ Failure ]
 crbug.com/492664 [ Linux ] imported/csswg-test/css-writing-modes-3/box-offsets-rel-pos-vrl-004.xht [ Failure ]
 crbug.com/492664 [ Mac ] imported/csswg-test/css-writing-modes-3/bidi-embed-002.html [ Failure ]
 crbug.com/492664 [ Mac ] imported/csswg-test/css-writing-modes-3/bidi-isolate-002.html [ Failure ]
 crbug.com/492664 [ Win ] imported/csswg-test/css-writing-modes-3/bidi-override-005.html [ Failure ]
 crbug.com/492664 [ Win ] imported/csswg-test/css-writing-modes-3/bidi-plaintext-001.html [ Failure ]
 
 crbug.com/267206 [ Mac ] virtual/rootlayerscrolls/fast/scrolling/scrollbar-tickmarks-hittest.html [ Timeout ]
@@ skipping 1114 matching lines @@
 crbug.com/638618 inspector/editor/text-editor-search-switch-editor.html [ Skip ]
 
 # This test breaks when the feature introduced in the bug is enabled. We keep
 # this tested without the feature by using the virtual test. See
 # virtual/stable/http/tests/navigation/beacon-cross-origin-redirect-blob-expected.txt
 crbug.com/490015 http/tests/navigation/beacon-cross-origin-redirect-blob.html [ Skip ]
 # This test doesn't need to be run with the stable release mode.
 crbug.com/490015 virtual/stable/http/tests/navigation/beacon-blob-with-non-simple-type.html [ Skip ]
 # This test fails with the stable release mode.
 crbug.com/490015 virtual/stable/http/tests/navigation/same-and-different-back.html [ Skip ]