Send the remote tracked ref to Rietveld via upload.py

Send the remote tracked ref to Rietveld via upload.py

This change is due to https://codereview.chromium.org/781523002/

More context is in Aaron's comment here:
https://codereview.chromium.org/781523002/#msg11

BUG=435702
TBR=
NOTRY=true

Committed: https://chromium.googlesource.com/infra/infra/+/83e54e5867629315b1af364ea39315664f0630b2

[rmistry, 2014-12-09 23:56:35]

rmistry@google.com changed reviewers:
+ agable@chromium.org, jrobbins@chromium.org

[Jason Robbins -- corp, 2014-12-10 00:00:59]

jrobbins@google.com changed reviewers:
+ jrobbins@google.com

[Jason Robbins -- corp, 2014-12-10 00:01:00]

lgtm

[rmistry, 2014-12-10 12:25:15]

The CQ bit was checked by rmistry@google.com

[commit-bot: I haz the power, 2014-12-10 12:26:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/746343004/1

[commit-bot: I haz the power, 2014-12-10 12:26:04]

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

[commit-bot: I haz the power, 2014-12-10 12:26:05]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[rmistry, 2014-12-10 12:28:17]

On 2014/12/10 12:26:05, I haz the power (commit-bot) wrote:
> No LGTM from a valid reviewer yet. Only full committers are accepted.
> Even if an LGTM may have been provided, it was from a non-committer,
> _not_ a full super star committer.
> See http://www.chromium.org/getting-involved/become-a-committer
> Note that this has nothing to do with OWNERS files.

I forgot that you are not a committer yet, should happen in less than a week
though!

[rmistry, 2014-12-10 12:28:21]

The CQ bit was checked by rmistry@google.com

[commit-bot: I haz the power, 2014-12-10 12:29:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/746343004/1

[rmistry, 2014-12-10 12:34:24]

The CQ bit was unchecked by rmistry@google.com

[rmistry, 2014-12-10 12:34:31]

The CQ bit was checked by rmistry@google.com

[commit-bot: I haz the power, 2014-12-10 12:34:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/746343004/1

[commit-bot: I haz the power, 2014-12-10 12:34:46]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/infra/infra/+/83e54e5867629315b1af364ea3931...