Update GN files w/ changes needed to make sanitizers work.

This is a set of build changes that are needed to make the
sanitizers (and sanitizer bots) work correctly. This change
should have no functional effect on the bots, since none of
the sanitizer bots are using GN yet; a follow-on CL will flip
the bots to GN.

R=brettw@chromium.org, inferno@chromium.org, thakis@chromium.org
BUG=605732, 573288

Review-Url: https://codereview.chromium.org/2031903002
Cr-Original-Commit-Position: refs/heads/master@{#397952}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 9713aa43a050e81c74689be9ac11294632f44f8f
1 file changed