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Users have reported a subtle flash during the overview animation. This
is because the current cross fade animation fades out the old layer
while fading in the new layer. This will cause the combined opacities
of the two layers to be 1 at the endpoints, but less than 1 in
between, resulting in the middle of the animation being slightly dimmer.

Discussed with UX in the bug, and make the only the old layer fade out.
This will result in the combined opacity always being 1.

Test: manual
Change-Id: Iacc7adcbc424f59656d7876bfecf32e3cb048b2d
Fixed: 1124947
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2481002
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#818590}