[test] Make missing files result in a proper test runner error.

[test] Make missing files result in a proper test runner error.

BUG=

Committed: https://crrev.com/cd803b154737cbdfddbc7805f612dae4bac94ed4
Cr-Commit-Position: refs/heads/master@{#33684}

[Michael Achenbach, 2016-02-02 13:36:45]

Patchset #5 (id:80001) has been deleted

[Michael Achenbach, 2016-02-02 13:37:26]

The CQ bit was checked by machenbach@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-02-02 13:37:34]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1652003002/100001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1652003002/100001

[Michael Achenbach, 2016-02-02 13:38:37]

machenbach@chromium.org changed reviewers:
+ jkummerow@chromium.org

[Michael Achenbach, 2016-02-02 13:38:38]

PTAL. Patch 3 demonstrates the problem. The builds are green despite missing
files. Patch 4 adds a fix and demonstrates that the run breaks.

[Jakob Kummerow, 2016-02-02 13:42:56]

"Internal error in a worker process" isn't a very helpful message, but since
this is apparently just a temporary state of things: LGTM.

[Michael Achenbach, 2016-02-02 13:47:06]

On 2016/02/02 13:42:56, Jakob wrote:
> "Internal error in a worker process" isn't a very helpful message, but since
> this is apparently just a temporary state of things: LGTM.

The actual error is not passed through formally unfortunately. But it's printed
and one can search for it in the output that came before. This is not very nice
yet, but it's much better than a "silent green".

[Michael Achenbach, 2016-02-02 13:52:32]

The CQ bit was unchecked by machenbach@chromium.org

[Michael Achenbach, 2016-02-02 13:52:37]

The CQ bit was checked by machenbach@chromium.org

[commit-bot: I haz the power, 2016-02-02 13:52:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1652003002/100001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1652003002/100001

[commit-bot: I haz the power, 2016-02-02 13:58:41]

Committed patchset #5 (id:100001)

[commit-bot: I haz the power, 2016-02-02 13:59:17]

Description was changed from

==========
[test] Make missing files result in a proper test runner error.

BUG=
==========

to

==========
[test] Make missing files result in a proper test runner error.

BUG=

Committed: https://crrev.com/cd803b154737cbdfddbc7805f612dae4bac94ed4
Cr-Commit-Position: refs/heads/master@{#33684}
==========

[commit-bot: I haz the power, 2016-02-02 13:59:17]

Patchset 5 (id:??) landed as
https://crrev.com/cd803b154737cbdfddbc7805f612dae4bac94ed4
Cr-Commit-Position: refs/heads/master@{#33684}