Add app_list_unittests as a test step and tree closer on mac, win, and linux_aura.

Add app_list_unittests as a test step and tree closer on mac, win, and linux_aura.

app_list_unittests has been built on all non-linux targets since r178260. It was
added as a default build target for linux_aura in r225936.

On linux_chromeos (only) it is already a test step in the waterfall builders, a tree
closer, and a CQ step for linux_chromeos.

This CL adds app_list_unittests as a test step and tree closer on all platforms
that build the target, which is now everything but gtk-linux and mobile.

BUG=169114, 166730
R=stip@chromium.org, xusydoc@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=229248

[tapted, 2013-10-17 01:49:48]

Hi Mike, are you a good reviewer for this?

Pretty sure this will do what we want, but let me know if I should split it up
and land in stages.

For win/mac, I ran some opt-in jobs at
https://codereview.chromium.org/14566012/#ps6001 to check they're still happy.
linux_aura isn't a test step yet.

Note there is a follow-up in CL-26484004 for adding it to the CQ which I'll put
up after this is happily landed.

[ghost stip (do not use), 2013-10-17 20:50:00]

lgtm, make sure to land in sync with https://codereview.chromium.org/26484004/

[Mike Stip (use stip instead), 2013-10-17 20:50:44]

lgtm

[tapted, 2013-10-17 23:22:27]

Committed patchset #2 manually as r229248 (presubmit successful).

[cmp, 2013-10-19 03:15:30]

This CL didn't add app_list_unittests to tryserver.chromium win7_aura.  In
https://codereview.chromium.org/26484004/, the CQ started depending on that, and
now the CQ is backed up waiting for a config to complete that doesn't exist.  I
uploaded https://codereview.chromium.org/29213006 to fix this on the next
tryserver restart over the long-term and will back out
https://codereview.chromium.org/26484004/ to fix this for the short-term.