This is necessary to unblock migration to Polymer 2. My existing attempt at [1] has triggered a bunch of a11y errors, see [2] (also pasting below.
PDFExtensionTest.Basic
MediaRouterElementsBrowserTest.MediaRouterContainerSearchPart1
SettingsAccessibilityTest.MANAGE_PROFILE_aria_valid_attr_value
MediaRouterElementsBrowserTest.MediaRouterContainerSearchPart2
SettingsAccessibilityTest.MANAGE_PROFILE_tabindex
MediaRouterElementsBrowserTest.MediaRouterContainerFilterPart2
MediaRouterElementsBrowserTest.MediaRouterContainerFilterPart1
After consulting with hcarmona, these seem to be false positives, and those tests need to be updated.
[1] https://chromium-review.googlesource.com/c/chromium/src/+/892299
[2] https://ci.chromium.org/buildbot/tryserver.chromium.linux/linux_chromium_rel_ng/634922
Comment 1 by dpa...@chromium.org
, Jan 31 2018