It also hooks up libpdf which chrome requires at startup.
Adds the enable_hidpi and use_athena build flags.
Adds a locales list.
This makes the chrome target actually runnable from a GN build.
R=jamesr@chromium.org
Review URL: https://codereview.chromium.org/541153002
Cr-Original-Commit-Position: refs/heads/master@{#293360}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 6a90cafc8e2b0f1e1bc6a8f7e69470ac8acfa253
Brett Wilson