[AUTO UPDATE] Copying from upstream Mojo Repository.
d62de1a8ac7603c85917df9149578e22acfa2d0b
Mon, 20 Jun 2016 09:53:50 -0700, jamesr@chromium.org
Roll buildtools to 3780bc523aad1d68a5bd00e05c453a80b2ba0b35
This directory contains the contents of upstream Mojo's build/ directory.
At the moment, it is not meant to be built alone. Instead, it should be pulled into a repository which is using componentized Mojo (through either Jiri or gclient).