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This CL allows Chrome OS to query ARC for whether a PWA has a supported
related app available and installable. If it does, the installation
action redirects to the Play Store. A Finch kill-switch to disable the
behaviour is also added.

BUG=969560

Change-Id: I7f2d748836400aecec40655e25de0e2f901c4432
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1642753Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666623}