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The placeholder text needs to be updated and a chip added which allows
the user to navigate to the Files app. Note that the UX spec has not yet
been delivered so font sizes, spacing, etc. are subject to change. Also
note that the Files app icon still needs to be plugged in.

This CL also fixes some focus rings which were incorrectly colored.

Screenshot: http://shortn/_0FB67SM4PA

Bug: 1159527
Change-Id: I88e1e7cbc90178f558d2d3490bbd10a358f72c70
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2596218
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837855}