WPT import https://crrev.com/c/1093116 introduced new failures in external/wpt/css/css-masking:

List of new failures:
external/wpt/css/css-masking/idlharness.html new failing tests: https://crrev.com/c/1093116/4/third_party/WebKit/LayoutTests/external/wpt/css/css-masking/idlharness-expected.txt

This import contains upstream changes from 0e084a927078d434bcc1952a2ab99fb541f2c25d to ede8a377b16bae4482b312b30db328154fdba0db:
[css-logical-properties-1] Add test case margin{-block,-inline}{-start,-end} (#11431): https://github.com/web-platform-tests/wpt/commit/ede8a377b16bae4482b312b30db328154fdba0db [affecting this directory]
Add the InputDeviceCapabilities IDL file with test (#9755): https://github.com/web-platform-tests/wpt/commit/3bc4498426ab48d6e580cb00802bca50e3220317
[idlharness.js] Test exposure set of partial interfaces (#11419): https://github.com/web-platform-tests/wpt/commit/24d1bbe29fd1ca3ca18e5154d99058be87cb2f24
Add ResizeObserver IDL file with test (#9756): https://github.com/web-platform-tests/wpt/commit/7684fe30a809662f2af99a78f7c4671195573ce8
Add css-masking IDL file with test (#9905): https://github.com/web-platform-tests/wpt/commit/82a7c8930aae4df57dbd7895b8d3038c095f0790 [affecting this directory]
Update the performance-timeline and user-timing  IDL files (#9837): https://github.com/web-platform-tests/wpt/commit/8cce35711430779302fab1c7f6fda492cd1853a5
CSS Typed OM: Proper types for custom props during iteration.: https://github.com/web-platform-tests/wpt/commit/36bb4d778a8ad51a46e478b6ca98e39cc6f5a8e7 [affecting this directory]
Exclude more labels in "Reviewed but still open PRs" (#11378): https://github.com/web-platform-tests/wpt/commit/185e07d903b514f8d1a4564923ba63fd4e6c3476
Use `variant` for window-open-noopener: https://github.com/web-platform-tests/wpt/commit/837fc78d84247e16ce7d346ca671bd795e594d7c