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CSS variable does not work for animation-timing-function in @keyframes
(https://crbug.com/1066798). This CL splits the show/hide banner
animation into two animations with different timing function.

Bug: 1162044
Test: Manually
Change-Id: I15a95b927ca60abb283791e2a2b94cb21b2e3783
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2612357
Auto-Submit: Shik Chen <shik@chromium.org>
Reviewed-by: Wei Lee <wtlee@chromium.org>
Commit-Queue: Shik Chen <shik@chromium.org>
Commit-Queue: Wei Lee <wtlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841935}