Support --nocommit option to git-cl-patch for gerrit.
Support --nocommit option to git-cl-patch for gerrit.

R=agable@chromium.org,a30c74fa30536fe7ea81ed6dec202e35e149e1fd@chromium.org

Bug:
Change-Id: I7a5ec6ca1bb05d67b1ddbee60eac89d57464a480
Reviewed-on: https://chromium-review.googlesource.com/710007
Reviewed-by: Andrii Shyshkalov <a30c74fa30536fe7ea81ed6dec202e35e149e1fd@chromium.org>
Commit-Queue: Stefan Zager <542cb5b73770f9741bae40d34cf7a192bc7ad2cc@chromium.org>

CoherentLabs/depot_tools,CoherentLabs/depot_tools