The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/94f73c221e2b754bd7a8109fb2043bffa91e6f1e

commit 94f73c221e2b754bd7a8109fb2043bffa91e6f1e
Author: Tom Anderson <thomasanderson@chromium.org>
Date: Fri Jul 13 16:59:52 2018

Add tools/gn/bootstrap back

bootstrap.py does not exist in the gn.googlesource.com repo.  The script
gen/build.py is used instead.  However, there are some differences to
bootstrap.py: one obvious one is the name and location.  This breaks chromium
packagers relying on bootstrap.py, so this change adds the script back.  In the
long-term, it should forward to gen.py.

BUG= 859536 , 863459 , 863460 

Change-Id: I59ff81acb7f409d1975f99bcf0676e6103b2d7b9
Reviewed-on: https://chromium-review.googlesource.com/1136656
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574952}
[add] https://crrev.com/94f73c221e2b754bd7a8109fb2043bffa91e6f1e/tools/gn/bootstrap/OWNERS
[add] https://crrev.com/94f73c221e2b754bd7a8109fb2043bffa91e6f1e/tools/gn/bootstrap/bootstrap.py
[add] https://crrev.com/94f73c221e2b754bd7a8109fb2043bffa91e6f1e/tools/gn/bootstrap/build.ninja.template
[add] https://crrev.com/94f73c221e2b754bd7a8109fb2043bffa91e6f1e/tools/gn/bootstrap/build_aix.ninja.template
[add] https://crrev.com/94f73c221e2b754bd7a8109fb2043bffa91e6f1e/tools/gn/bootstrap/build_mac.ninja.template
[add] https://crrev.com/94f73c221e2b754bd7a8109fb2043bffa91e6f1e/tools/gn/bootstrap/build_vs.ninja.template