(The bot does release component builds; maybe the tests are too slow in component builds?)

johnchen: ping? this is keeping our bot red

Taking a look.

This bot has a configuration (is_component_build = true, is_debug = false) that chromedriver_py_tests hasn't been tested against. I have a potential fix. Is there any way to try the fix on the bot before checking it in?

Not on the bot, but you could check locally I suppose. Just landing and watching the bot seems fine to me too.

I'll try to verify the fix locally and then check it in.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e6c0ad8e8cdabe0b2c0160979f64c650e9dffc36

commit e6c0ad8e8cdabe0b2c0160979f64c650e9dffc36
Author: John Chen <johnchen@chromium.org>
Date: Fri Feb 23 20:34:52 2018

[ChromeDriver] Fix chromedriver_py_tests on Mac component build

Add a missing dependency that was causing chromedriver_py_tests to
fail on Mac when is_component_build=true.

Bug:  814818 
Change-Id: I923d6e96910255380669d5f02f3bc828feaa3396
Reviewed-on: https://chromium-review.googlesource.com/935287
Commit-Queue: John Chen <johnchen@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#538881}
[modify] https://crrev.com/e6c0ad8e8cdabe0b2c0160979f64c650e9dffc36/chrome/test/chromedriver/BUILD.gn

The fix is checked in, and the builds are green starting with https://ci.chromium.org/buildbot/chromium.clang/ToTMac/1276.

Thanks!