OffscreenCanvas-MessageChannel-transfer can be flaky

This looks like another offscreen canvas test that can finish before
the resulting image is ready. See crbug.com/1315650

Bug: 1322089
Change-Id: Ie6bbeb6e81dcde20c123aa64140bafeadec46561
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3630882
Reviewed-by: Aaron Krajeski <aaronhk@chromium.org>
Commit-Queue: Aaron Krajeski <aaronhk@chromium.org>
Reviewed-by: Juanmi Huertas <juanmihd@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1002323}

third_party/blink/web_tests/TestExpectations

@@ -248,6 +248,10 @@ crbug.com/1123606 virtual/fenced-frame-mparch/* [ Pass ]
 crbug.com/1311760 [ Mac ] virtual/oopr-canvas2d/fast/canvas/OffscreenCanvas-2d-gradients-in-worker.html [ Failure ]
 crbug.com/1311760 [ Mac ] virtual/oopr-canvas2d/fast/canvas/OffscreenCanvas-paths-in-worker.html [ Failure ]
 
+# Offscreen canvas tests that are flaky because sometimes the image is not rendered in time
+# See crbug.com/1315650
+crbug.com/1322089 virtual/gpu/fast/canvas/OffscreenCanvas-MessageChannel-transfer.html [ Pass Failure ]
+
 # These tests require shared-storage and fenced-frames
 # Keep this in sync with VirtualTestSuites.
 crbug.com/1218540 wpt_internal/shared_storage/* [ Skip ]