build: make orderfile generation public

This CL allows orderfiles to be generated and tested without an internal
checkout of chromium. To do this, pass --public when calling
tools/cygprofile/orderfile_generator_backend.py.

The orderfiles will be placed in //orderfiles.

You can set 'chrome_orderfile = "//orderfiles/orderfile.$ARCH.out"'
to use the orderfile when building.

Bug: 922460
Change-Id: I349834e80ce34766f0ba9c9e0b4db91c34323274
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1524297
Reviewed-by: Matthew Cary <mattcary@chromium.org>
Commit-Queue: Matthew Cary <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#643779}
2 files changed