Reland of Gerrit git cl: implement git cl patch. (patchset #1 id:1 of https://codereview.chromium.org/1848393002/ )

Reason for revert:
nope, the windows breakage is due to apply_issue failing to connect to Rietveld.

Original issue's description:
> Revert of Gerrit git cl: implement git cl patch. (patchset #7 id:120001 of https://codereview.chromium.org/1852593002/ )
> 
> Reason for revert:
> just in case.
> 
> Original issue's description:
> > Gerrit git cl: implement git cl patch.
> > 
> > BUG=579182
> > 
> > Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=299644
> 
> TBR=andybons@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=579182
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=299645

TBR=andybons@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=579182

Review URL: https://codereview.chromium.org/1852803002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299647 0039d316-1c4b-4281-b951-d872f2087c98