Add Visual Studio 2013 to the autodetect list
Add Visual Studio 2013 to the autodetect list

BUG=377
R=scottmg@chromium.org

Review URL: https://codereview.chromium.org/55493003
old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google,old8xp/gyp_from_google