Add UseBackground.

Add UseBackground.

Fixes #39.

R=dnj@chromium.org, estaab@chromium.org, martiniss@chromium.org, vadimsh@chromium.org
BUG=

Committed: https://github.com/luci/gae/commit/ea770b89291efbda72378f5a313967aec98b6bd9

[martiniss, 2016-01-25 18:53:33]

lgtm

[Vadim Sh., 2016-01-25 18:56:17]

https://chromiumcodereview.appspot.com/1630833002/diff/1/impl/prod/context.go
File impl/prod/context.go (right):

https://chromiumcodereview.appspot.com/1630833002/diff/1/impl/prod/context.go...
impl/prod/context.go:90: // implementations which aren't associated with any
particular request.
What are conditions of it working? Can you please document them (i.e. MVM or
backgroud thread).

[iannucci, 2016-01-25 19:02:36]

On 2016/01/25 at 18:56:17, vadimsh wrote:
> https://chromiumcodereview.appspot.com/1630833002/diff/1/impl/prod/context.go
> File impl/prod/context.go (right):
> 
>
https://chromiumcodereview.appspot.com/1630833002/diff/1/impl/prod/context.go...
> impl/prod/context.go:90: // implementations which aren't associated with any
particular request.
> What are conditions of it working? Can you please document them (i.e. MVM or
backgroud thread).

Oops, you're right, it only works on MVMs. PTAL?

[Vadim Sh., 2016-01-25 19:08:07]

lgtm

[iannucci, 2016-01-25 19:08:34]

The CQ bit was checked by iannucci@chromium.org

[iannucci, 2016-01-25 19:08:34]

The patchset sent to the CQ was uploaded after l-g-t-m from
martiniss@chromium.org
Link to the patchset: https://chromiumcodereview.appspot.com/1630833002/#ps20001
(title: "Make BackgroundContext only available on managed VMs, document")

[commit-bot: I haz the power, 2016-01-25 19:08:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1630833002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1630833002/20001

[commit-bot: I haz the power, 2016-01-25 19:09:46]

Description was changed from

==========
Add UseBackground.

Fixes #39.

R=dnj@chromium.org, estaab@chromium.org, martiniss@chromium.org,
vadimsh@chromium.org
BUG=
==========

to

==========
Add UseBackground.

Fixes #39.

R=dnj@chromium.org, estaab@chromium.org, martiniss@chromium.org,
vadimsh@chromium.org
BUG=

Committed:
https://github.com/luci/gae/commit/ea770b89291efbda72378f5a313967aec98b6bd9
==========

[commit-bot: I haz the power, 2016-01-25 19:09:47]

Committed patchset #2 (id:20001) as
https://github.com/luci/gae/commit/ea770b89291efbda72378f5a313967aec98b6bd9