adb_wait_for_device: Skip `adb wait-for-device`

adb_wait_for_device: Skip `adb wait-for-device`

This should still wait for the device to be attached and finished
booting, but will prevent no-output timeouts due to
`adb wait-for-device` never finishing.

The effect should be that, when an Android device is disconnected, the
"wait for device" step will run forever, or until the device
reconnects. This should prevent a disconnected device from spreading
purple all over the status page.

BUG=skia:

Committed: https://skia.googlesource.com/skia/+/ad54ffc235ea02438a8510feccba9657033b5ec5

[borenet, 2015-09-03 17:04:42]

borenet@google.com changed reviewers:
+ djsollen@google.com

[djsollen, 2015-09-03 17:15:51]

how will this prevent no output timeouts? Does the shell commmand just keep
returning an error if there is no device?

[borenet, 2015-09-03 17:16:37]

On 2015/09/03 17:15:51, djsollen wrote:
> how will this prevent no output timeouts? Does the shell commmand just keep
> returning an error if there is no device?

Yep, it continues to fail and loop.

[djsollen, 2015-09-03 17:35:53]

lgtm

[borenet, 2015-09-03 17:36:02]

The CQ bit was checked by borenet@google.com

[commit-bot: I haz the power, 2015-09-03 17:36:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1315753010/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1315753010/1

[commit-bot: I haz the power, 2015-09-03 17:41:10]

Committed patchset #1 (id:1) as
https://skia.googlesource.com/skia/+/ad54ffc235ea02438a8510feccba9657033b5ec5