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This addresses #1, #2, #5, and #6 from the attached bug.

#3 and #4 are not addressed because there isn't a good way to do so without relying on TabStrip::GetTabAnimationTargetBounds, which in turn relies on the soon-to-be-deprecated BoundsAnimator. If there is a replacement in the new animation system we can revisit, but otherwise it's likely not worth it to fix. The issue is only visible during the brief period when a tab is animating across the tab strip, and it's not present when dragging.

See the screenshots on the attached bug for updated visuals.

Bug: 1008438
Change-Id: I013f3a8bd141ec8e159773522251f5fb4eadd8d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1830400
Commit-Queue: Connie Wan <connily@chromium.org>
Reviewed-by: Taylor Bergquist <tbergquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701362}