GitLab

This is required as the shelf wants to use the same bounds animator to
record multiple histograms. See crrev.com/c/2105675 for a usage.

Test: added a tests
Bug: 1051490
Change-Id: Ie749ddd254ac8ae5e66229ec4b64cf86b5baa542
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2128373Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#755130}