WPT import https://crrev.com/c/1165103 introduced new failures in external/wpt/css:

List of new failures:
[ Linux Win ] external/wpt/css/css-contain/contain-size-025.html [ Failure ]
external/wpt/css/css-contain/contain-paint-clip-016.html [ Failure ]
external/wpt/css/css-contain/contain-layout-cell-001.html [ Failure ]
external/wpt/css/css-contain/contain-style-counters-003.html [ Failure ]
external/wpt/css/css-contain/contain-layout-cell-002.html [ Failure ]
external/wpt/css/css-contain/contain-paint-clip-015.html [ Failure ]
external/wpt/css/css-contain/contain-size-monolithic-001.html [ Failure ]
external/wpt/css/css-contain/contain-style-counters-004.html [ Failure ]

This import contains upstream changes from 218d54abec70d94a6c79f44e8cb6d29ba493af40 to 5a3a984492dcd1b1586576790922baf0a208dfb5:
Use a .worker.js test for WorkerGlobalScope_requestAnimationFrame.: https://github.com/web-platform-tests/wpt/commit/5a3a984492dcd1b1586576790922baf0a208dfb5
[LayoutNG] Pass constraint space to inline children for min/max.: https://github.com/web-platform-tests/wpt/commit/25475a3887220baee22dfef032474040401d84e3 [affecting this directory]
Add the screen-capture IDL file + test (#12284): https://github.com/web-platform-tests/wpt/commit/ae2f8dd7e531d6da7a651021dd00af9f3082d58d
[css-grid] Change how percentage row tracks and gaps are resolved: https://github.com/web-platform-tests/wpt/commit/244c6baf38953eac29840e2fbcb8a42dd8bafe88 [affecting this directory]
Add Web Speech API IDL file + test (#12317): https://github.com/web-platform-tests/wpt/commit/9d6cc1e097031d1a2eda42b61a94e660be3ed5b0
Sync whitespace IDL differences in interfaces/ (#12335): https://github.com/web-platform-tests/wpt/commit/7a1693d502a3da45c3de530ae390c268fcbe9454
Add more suggested reviewers for Priority Hints: https://github.com/web-platform-tests/wpt/commit/0de692bce7f4c1834ae3f3c86229caa16372a771
Add interfaces/README.md to explain reffy-reports origins (#12295): https://github.com/web-platform-tests/wpt/commit/dd299f45326e12acf453a14db5b582eba6d5db63
Introduce AgentClusterID to serialized messages: https://github.com/web-platform-tests/wpt/commit/44cf7952750b5ce5ead67966d2e5304753aef930
Sync trivial IDL differences in interfaces/ (#12318): https://github.com/web-platform-tests/wpt/commit/8a3936785bc01f4c72cc2a115a693d7f253083a7
[css-grid] Apply content alignment during second pass: https://github.com/web-platform-tests/wpt/commit/0bc8ef9382a661bcb48b70de19f3d0fedd0646f2 [affecting this directory]
Fix the wpt/webrtc/RTCRtpParameters-transactionId test: https://github.com/web-platform-tests/wpt/commit/7efb0abee8f5d26ff5010a901f13de3a1b3ff46c
Origin Policy: Web Platform Tests for Origin Policy w/ CSP.: https://github.com/web-platform-tests/wpt/commit/d93204236e8ea2569900a546fe83ceb54b301e6a
Try less trailing newlines: https://github.com/web-platform-tests/wpt/commit/41c5a5ec588f4e0e7b31ee9964831712848d8b44
Harden the tests with more pre-conditions and inlining the expected values: https://github.com/web-platform-tests/wpt/commit/296d1b40a7467425ffa9807aee03c8b40f748357
Convert Microsoft's selection tests to testharness.js: https://github.com/web-platform-tests/wpt/commit/ce6a003b3a83e81839be4af880a7f9974e35395c
Wrap a stray assert (causing harness error) in a test: https://github.com/web-platform-tests/wpt/commit/a3eddf0b1e19aa1152e38fdaabf31cbe67d4c6fd
Fix a t.assert_unreached typo in a CSP test helper (#12303): https://github.com/web-platform-tests/wpt/commit/64a9cbb9aec8db0f84c076ae77045297fe8ea320
Add @andypaicu as suggested reviewer for CSP (#12322): https://github.com/web-platform-tests/wpt/commit/aafc251761fbb7c47cc72f37e9b07f790675c335
Test that SpeechSynthesisUtterance's voice attribute is initially null (#12319): https://github.com/web-platform-tests/wpt/commit/edb72456b7341d3dcc14323423a295261f67b25f
 Import Web Speech API conformance tests (#11550): https://github.com/web-platform-tests/wpt/commit/0dd7e32fc4638c07f3760d85e6fcdf0c347888df
Add negative test for SpeechRecognitionError (#12320): https://github.com/web-platform-tests/wpt/commit/6ab60d65618bb37f0d473624a4c3289edbada3ae
Merge pull request #12312 from TalbotG/contain-gtalbot-nr1: https://github.com/web-platform-tests/wpt/commit/58b45e6af645cf8262abfd6c4763508e6926fa33
[css-contain] Improve the coverage and correctness of the css-contain test suite: https://github.com/web-platform-tests/wpt/commit/992265ed07e93ec81acfeb44da6f0e7822511c40 [affecting this directory]