This will allow for easier dependency management in the build files.

Bug: angleproject:2995
Change-Id: Ia3464bf622b861df03c3d06bcf1b34874a9a5400
Reviewed-on: https://chromium-review.googlesource.com/c/1385025
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>