GitLab

Re-write the math in GetSizeForLabelWidth and GetWidthBetween
(nee WidthMultiplier) so that the tween is correctly calculated
for the in-out animation.

Bug: 1005837
Change-Id: I729b6bb43265fdb7cb0aab52e6ae10e3c41a0702
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863351
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709112}