Add support for -tags to enable appengine testing.

Add support for -tags to enable appengine testing.

Will let us support packages which require -tags=appengine to build correctly!

R=vadimsh@chromium.org
BUG=

Committed: https://chromium.googlesource.com/infra/infra/+/f867da8c88f1dbf34a6e245cba2c859bb89b2fa6

[iannucci, 2015-03-29 05:02:05]

Patchset #2 (id:20001) has been deleted

[Vadim Sh., 2015-03-30 06:05:40]

lgtm

how does goconvey discover what tags to use?

https://codereview.chromium.org/1042633002/diff/1/go/test.py
File go/test.py (right):

https://codereview.chromium.org/1042633002/diff/1/go/test.py#newcode183
go/test.py:183: cmd = ['go', 'test', package, ]
nit: remove ", "

[iannucci, 2015-03-30 19:20:22]

On 2015/03/30 06:05:40, Vadim Sh. wrote:
> lgtm
> 
> how does goconvey discover what tags to use?

it didn't until https://github.com/smartystreets/goconvey/pull/315

> 
> https://codereview.chromium.org/1042633002/diff/1/go/test.py
> File go/test.py (right):
> 
> https://codereview.chromium.org/1042633002/diff/1/go/test.py#newcode183
> go/test.py:183: cmd = ['go', 'test', package, ]
> nit: remove ", "

[iannucci, 2015-04-04 04:20:55]

The CQ bit was checked by iannucci@chromium.org

[iannucci, 2015-04-04 04:20:56]

The patchset sent to the CQ was uploaded after l-g-t-m from vadimsh@chromium.org
Link to the patchset: https://codereview.chromium.org/1042633002/#ps40001
(title: "remove comma")

[commit-bot: I haz the power, 2015-04-04 04:21:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1042633002/40001

[commit-bot: I haz the power, 2015-04-04 04:23:29]

Committed patchset #2 (id:40001) as
https://chromium.googlesource.com/infra/infra/+/f867da8c88f1dbf34a6e245cba2c8...