[WPT] Update CSS animation tests
Created attachment 450213 [details] Patch
This patch modifies the imported WPT tests. Please ensure that any changes on the tests (not coming from a WPT import) are exported to WPT. Please see https://trac.webkit.org/wiki/WPTExportProcess
Created attachment 450268 [details] Patch for landing
Created attachment 450278 [details] Patch for landing
Committed r288787 (246564@trunk): <https://commits.webkit.org/246564@trunk>
<rdar://problem/88309496>