WPT import https://crrev.com/c/1096534 introduced new failures in external/wpt/offscreen-canvas:

List of new failures:
external/wpt/offscreen-canvas/the-offscreen-canvas/offscreencanvas.transfer.to.imagebitmap.w.html new failing tests: https://crrev.com/c/1096534/4/third_party/WebKit/LayoutTests/external/wpt/offscreen-canvas/the-offscreen-canvas/offscreencanvas.transfer.to.imagebitmap.w-expected.txt

This import contains upstream changes from acba5ffb1bf7a3958bb5d70d94513912a61cbc52 to be959408023fe02cf79abe70f6018598a7004a88:
Adjust test thresholds for win10: https://github.com/web-platform-tests/wpt/commit/be959408023fe02cf79abe70f6018598a7004a88
[testharness.js] Extend test suite with "variants": https://github.com/web-platform-tests/wpt/commit/08995880734011eed359c4e79420db29626016ff
[sensors] Check that sensor frame and focused frame of same origin: https://github.com/web-platform-tests/wpt/commit/46fe6803fdd163e21137ba06b81558d6ba34ad12
Offscreen canvas: make worker tests catch errors: https://github.com/web-platform-tests/wpt/commit/8b2d92a0304de38fca9b1cee53f3769984dc0b9e [affecting this directory]
"Scroll an element into view" in HTML spec: https://github.com/web-platform-tests/wpt/commit/32f74fe70209b3df142a03957779a6d776a6f74a
HTML: Run a history navigation test in a popup to report a result (#11296): https://github.com/web-platform-tests/wpt/commit/2c4b6f9df0b187e0d4c1762d175e9f736492cf91