css underline offset issue related to Win10-18363 migration

Adding TestExpectation Failure for Win10 for
text-underline-offset-variable.html

Bug: 1140324
Change-Id: Ib74b37d45bb11267aba2c6f4bf7ed5b0e5c843d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2486569
Auto-Submit: Ian Struiksma <ianstruiksma@google.com>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Commit-Queue: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818854}

third_party/blink/web_tests/TestExpectations

@@ -864,6 +864,8 @@ crbug.com/1067242 [ Mac10.13 ] external/wpt/css/css-text-decor/text-decoration-t
 crbug.com/1068947 [ Win10 ] external/wpt/css/css-text-decor/text-underline-position-from-font-variable.html [ Failure ]
 crbug.com/1068947 [ Win10 ] external/wpt/css/css-text-decor/text-decoration-thickness-fixed.html [ Failure ]
 crbug.com/1068947 [ Win10 ] external/wpt/css/css-text-decor/text-decoration-thickness-from-font-variable.html [ Failure ]
+# Windows 10 bot upgrade now causes this failure on Windows-10-18363
+crbug.com/1140324 [ Win10 ] external/wpt/css/css-text-decor/text-underline-offset-variable.html [ Failure ]
 
 # Tentative mansonry tests
 crbug.com/1076027 external/wpt/css/css-grid/masonry/* [ Skip ]