[TabStrip] Restore tab creation/closure animations

Restore tab creation animation.
-Prevent early animation finish.
-Prevent animation values from being overridden.
-Use current instead of ideal width for tab placement.

Restore tab closure animation.
-Prevent overriding of current tab width.

Video: https://drive.google.com/file/d/1Y85E8fY1szEiaFObQPxzm8CwQZCh7JII/view?usp=share_link

Bug: 1425275
Change-Id: I6d9479835235d3f8dbe8c6e739084cd2103351f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4189928


Reviewed-by: Sirisha Kavuluru <skavuluru@google.com>
Commit-Queue: Sirisha Kavuluru <skavuluru@google.com>
Code-Coverage: Findit <findit-for-me@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1118915}