Let clients pass the verbose level they want to cpplint.
Let clients pass the verbose level they want to cpplint.

This came in this CL review https://codereview.chromium.org/947983003/

BUG=None
R=dpranke@chromium.org

Review URL: https://codereview.chromium.org/955713003

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@294207 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

svn2github/chromium-depot-tools,svn2github/chromium-depot-tools,svn2github/chromium-depot-tools