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Fixes buggy restore animation

BUG=955981
TEST=
Manual: maximize Play Store app then click restore: animation is done correctly
Unit tests: exo_unittests

Change-Id: I4a43b7f52e589603d20768bc4e8b30cb0d07dad4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1634418
Commit-Queue: Jorge Gil <jorgegil@google.com>
Auto-Submit: Jorge Gil <jorgegil@google.com>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671756}