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This CL adds the current track title and artist to the right of the
artwork in a vertical layout. This CL also fixes the elide behavior of
the app/source label on the header row.

See bug for pictures.

Bug: 991647
Change-Id: Ia9c8601a17e1ce472bb984e90cb8a11926edb307
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1752170Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Mia Bergeron <miaber@google.com>
Cr-Commit-Position: refs/heads/master@{#686494}