merge_pr_60346

Fix option-label-in-shadow-tree.html timeout

This test was timing out because testdriver-actions.js doesn't currently
work in reftests. Replacing the click on the select element with
select.showPicker() and test_driver.bless() fixes this.

Fixed: 515718315
Change-Id: I95b427c81c89a68c28d0db1b3307f297a6053bc3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7887532
Reviewed-by: David Grogan dgrogan@chromium.org
Commit-Queue: Joey Arhar jarhar@chromium.org
Reviewed-by: Joey Arhar jarhar@chromium.org
Cr-Commit-Position: refs/heads/main@{#1640196}