[CompositeAfterPaint] Unskip external/wpt/

Bug: 524134,923429
Change-Id: Ia87abca3ea20595e9057dd6fdccffea31e9cfacb
Reviewed-on: https://chromium-review.googlesource.com/c/1422757
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624279}
2 files changed