Capture log messages from the helper script.

Capture log messages from the helper script.

Logging these messages explicitly using LOG means that they get sent to
the web-app to help with debugging. Note that this means we lose the
timeout. LMK if you think that's more important than the log output.

BUG=524538
Committed: https://crrev.com/d0a19d4f0dd2dc5b146b3ba9f261219618a00c41
Cr-Commit-Position: refs/heads/master@{#346782}

[Jamie, 2015-08-27 00:54:51]

jamiewalch@chromium.org changed reviewers:
+ lambroslambrou@chromium.org

[Jamie, 2015-08-27 00:54:52]

ptal

[Lambros, 2015-09-01 23:00:53]

lgtm - please verify that we can still elevate to root.

[Jamie, 2015-09-01 23:03:24]

On 2015/09/01 23:00:53, Lambros wrote:
> lgtm - please verify that we can still elevate to root.

Verified.

[Jamie, 2015-09-01 23:03:27]

The CQ bit was checked by jamiewalch@chromium.org

[commit-bot: I haz the power, 2015-09-01 23:04:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1321583003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1321583003/20001

[commit-bot: I haz the power, 2015-09-01 23:28:20]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-01 23:29:02]

Patchset 2 (id:??) landed as
https://crrev.com/d0a19d4f0dd2dc5b146b3ba9f261219618a00c41
Cr-Commit-Position: refs/heads/master@{#346782}