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This replaces the default animation, slide-in from right to left, with a
custom one that slides in the device list only from the bottom. Also
used the correct background color instead of hardcoding white to support
dark theme.

Bug: 1001104, 1001550
Change-Id: Icffa16ea07250bf0f34ef1c8be2a5f6ff4b1db37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1789239Reviewed-by: Alex Chau <alexchau@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Alex Chau <alexchau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694807}