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This also adjusts the internal View hierarchy for the tab counter; this
will be important when the animation is changed to move the border and
the text separately.

Bug: 999557
Change-Id: I1f9f7d8544ca87e6ec463b29ce2370f1f88bedfa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1982722
Commit-Queue: Taylor Bergquist <tbergquist@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#728674}