Add cros wrapper to depot_tools.

Add cros wrapper to depot_tools.

The cros wrapper in depot_tools is a centralized wrapper for all cros
commands. Adding this to depot_tools allows developers to run the 'cros'
tool from anywhere inside a Chrome OS checkout.

BUG=none
TEST=Verify the cros wrapper works.


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=173491

[davidjames, 2012-12-16 05:32:05]

PTAL

[sosa, 2012-12-16 07:29:39]

lgtm

[commit-bot: I haz the power, 2012-12-16 16:53:47]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/davidjames@chromium.org/11600002/1

[commit-bot: I haz the power, 2012-12-16 16:55:56]

Presubmit check for 11600002-1 failed and returned exit status 1.

Running presubmit commit checks ...
Checking out rietveld...
Running save-description-on-failure.sh
Running push-basic.sh
Running upstream.sh
Running submit-from-new-dir.sh
Running abandon.sh
Running submodule-merge-test.sh
Running upload-local-tracking-branch.sh
Running hooks.sh
Running post-dcommit-hook-test.sh
Running upload-stale.sh
Running patch.sh
Running basic.sh

** Presubmit ERRORS **
Missing LGTM from an OWNER for files in these directories:
    depot_tools

Presubmit checks took 127.1s to calculate.

[Peter Mayo, 2012-12-17 18:16:27]

lgtm

[commit-bot: I haz the power, 2012-12-17 18:17:10]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/davidjames@chromium.org/11600002/1

[commit-bot: I haz the power, 2012-12-17 18:20:03]

Change committed as 173491