The mac_build.gypi is used to build Mac targets via ninja. The template runs gyp_chromium to generate a ninja project file, then gyp target that includes the template should include an action to run ninja for the desired targets.
BUG=None
Review URL: https://chromiumcodereview.appspot.com/10826169
git-svn-id: http://src.chromium.org/svn/trunk/src/build@150357 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
lliabraa@chromium.org