Check for empty output in adb_wait_for_charge.

Check for empty output in adb_wait_for_charge.

Example error in https://chromium-swarm.appspot.com/user/task/2f96d6439584e411

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2105813003

Committed: https://skia.googlesource.com/skia/+/d48e5b8640ebe7af2b29930e3839d1595d62d793

[dogben, 2016-06-28 19:16:19]

Description was changed from

==========
Check for empty output in adb_wait_for_charge.

Example error in https://chromium-swarm.appspot.com/user/task/2f96d6439584e411

BUG=skia:
==========

to

==========
Check for empty output in adb_wait_for_charge.

Example error in https://chromium-swarm.appspot.com/user/task/2f96d6439584e411

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2105813003
==========

[dogben, 2016-06-28 19:16:32]

The CQ bit was checked by benjaminwagner@google.com to run a CQ dry run

[commit-bot: I haz the power, 2016-06-28 19:16:43]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-06-28 19:34:59]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-06-28 19:35:00]

Dry run: This issue passed the CQ dry run.

[dogben, 2016-06-28 20:06:57]

benjaminwagner@google.com changed reviewers:
+ kjlubick@google.com

[kjlubick, 2016-06-29 11:59:00]

lgtm

[dogben, 2016-06-29 14:01:46]

The CQ bit was checked by benjaminwagner@google.com

[commit-bot: I haz the power, 2016-06-29 14:01:50]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-06-29 14:03:09]

Description was changed from

==========
Check for empty output in adb_wait_for_charge.

Example error in https://chromium-swarm.appspot.com/user/task/2f96d6439584e411

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2105813003
==========

to

==========
Check for empty output in adb_wait_for_charge.

Example error in https://chromium-swarm.appspot.com/user/task/2f96d6439584e411

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2105813003

Committed:
https://skia.googlesource.com/skia/+/d48e5b8640ebe7af2b29930e3839d1595d62d793
==========

[commit-bot: I haz the power, 2016-06-29 14:03:10]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/d48e5b8640ebe7af2b29930e3839d1595d62d793

[commit-bot: I haz the power, 2016-06-29 14:03:14]

CQ bit was unchecked.