Empty branch output:
# Empty branches
git branch -D ipc2 # Empty.
git branch -D m3 # Empty.
Empty branches that have origin/* as upstream will not be considered for deletion.
Provide distance from upstream in output, i.e.
# Branch gypi-own - [master: ahead 1, behind 281]
# Branch m2 - [master: ahead 1]
Review URL: https://chromiumcodereview.appspot.com/14446006
git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@196249 0039d316-1c4b-4281-b951-d872f2087c98