Add auto_stub mocking library.

Add auto_stub mocking library.

Copied with minor modification from depot_tools@cd1e3d4 aka r286273.
Removed '__version__' from auto_stub.py since it's now a part of a
bigger versioned package.

R=iannucci@chromium.org, maruel@chromium.org
BUG=

Committed: https://chromium.googlesource.com/infra/testing/testing_support/+/0ffa4a6

[Vadim Sh., 2014-07-29 20:30:10]

ptal

I want to use it in tests for infra/infra stuff.

[iannucci, 2014-07-29 20:36:38]

On 2014/07/29 20:30:10, Vadim Sh. wrote:
> ptal
> 
> I want to use it in tests for infra/infra stuff.

I'm assuming expect_tests still runs these?

[iannucci, 2014-07-29 20:37:17]

lgtm otherwise

[Vadim Sh., 2014-07-29 20:38:00]

On 2014/07/29 20:36:38, iannucci wrote:
> On 2014/07/29 20:30:10, Vadim Sh. wrote:
> > ptal
> > 
> > I want to use it in tests for infra/infra stuff.
> 
> I'm assuming expect_tests still runs these?

I haven't written them yet...

auto_stub is useful to mock time.time, logging, stuff like that. It's orthogonal
to expect_tests.

[M-A Ruel, 2014-07-29 20:41:33]

If you don't use third_party, which version is expected to be the source of
truth?

[iannucci, 2014-07-29 20:49:05]

On 2014/07/29 20:41:33, M-A Ruel wrote:
> If you don't use third_party, which version is expected to be the source of
> truth?

If you mean infra/infra.git, then the answer is:
https://chromium.googlesource.com/infra/infra/+/master/bootstrap/deps.pyl

This repo is the source of truth for this library. I plan to make it accessible
to depot_tools as well, but I haven't done that yet.

[Vadim Sh., 2014-07-29 20:50:55]

On 2014/07/29 20:49:05, iannucci wrote:
> On 2014/07/29 20:41:33, M-A Ruel wrote:
> > If you don't use third_party, which version is expected to be the source of
> > truth?
> 
> If you mean infra/infra.git, then the answer is:
> https://chromium.googlesource.com/infra/infra/+/master/bootstrap/deps.pyl
> 
> This repo is the source of truth for this library. I plan to make it
accessible
> to depot_tools as well, but I haven't done that yet.

IIUC, depot_tools and infra/infra are going to share this testing_support repo.
In that sense, depot_tools's copy is going to be replaced with what is in this
CL.

[M-A Ruel, 2014-07-29 20:52:32]

On 2014/07/29 20:50:55, Vadim Sh. wrote:
> On 2014/07/29 20:49:05, iannucci wrote:
> > On 2014/07/29 20:41:33, M-A Ruel wrote:
> > > If you don't use third_party, which version is expected to be the source
of
> > > truth?
> > 
> > If you mean infra/infra.git, then the answer is:
> > https://chromium.googlesource.com/infra/infra/+/master/bootstrap/deps.pyl
> > 
> > This repo is the source of truth for this library. I plan to make it
> accessible
> > to depot_tools as well, but I haven't done that yet.
> 
> IIUC, depot_tools and infra/infra are going to share this testing_support
repo.
> In that sense, depot_tools's copy is going to be replaced with what is in this
> CL.

Ok, as long as it's clear to you as it is being done and it's clearly marked in
the end of the move, I'm fine. lgtm

[Vadim Sh., 2014-07-29 21:59:34]

Committed patchset #1 manually as r0ffa4a6 (presubmit successful).