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This change adds the required icons to the gesture navigation OOBE
screen. Lottie animations are added as well, with one lottie animation
on each page (go back, go home, overview).

Bug: 976949
Change-Id: Ida70ee09793383ad29c94dd5719f9bc7e64440d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2066078Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Commit-Queue: Matthew Mourgos <mmourgos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744765}