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This replicates the desktop UI, with platform-appropriate adjustments.

Bug: 1040146
Change-Id: I33cea7dd37086d87580e149404ed3619a828ee45
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2240456Reviewed-by: Peter Conn <peconn@chromium.org>
Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
Commit-Queue: Ben Schwartz <bemasc@chromium.org>
Auto-Submit: Ben Schwartz <bemasc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782049}