GitLab

This CL adds a manifest for the Discover App so that it installs as a
System PWA with the correct icon, name, and theme color.

Bug: 836128
Change-Id: Idd2d86671caa50a02474a1785972aa7f1d7b1fe7
Reviewed-on: https://chromium-review.googlesource.com/c/1290051
Commit-Queue: calamity <calamity@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603434}