Checks in the gclient wrapper and when running any gclient git command.

TEST=none
BUG=none

Patch contributed by Nasser <nasser@codeaurora>

Review URL: http://codereview.chromium.org/518064

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@35762 0039d316-1c4b-4281-b951-d872f2087c98