GitLab

Use enum class instead of enum for BoundsAnimationMode.
enum class is more type safety.

Bug: 940736
Change-Id: Idc09b7b7f3beec8b179a989e1f5a7e02d7d4734f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2400581
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805291}