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Add a new component for oobe. The slides can be used for scrolling.
Contains title, body text and illustration.

Bug: 1117161
Change-Id: If583db26a82d108a96c33c71616b2e01d38180e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2362812
Commit-Queue: Danila Kuzmin <dkuzmin@google.com>
Reviewed-by: Roman Aleksandrov <raleksandrov@google.com>
Reviewed-by: Denis Kuznetsov [CET] <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800133}