git-sync-deps verifies that directory is a top-level git directory.

NOTRY=true
R=mtklein@google.com

Author: halcanary@google.com

Review URL: https://codereview.chromium.org/245503003

git-svn-id: http://skia.googlecode.com/svn/trunk@14285 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed