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The underline is composed of two parts:
1) A straight underline, painted by TabStrip, extending from the group header to the last time (minus some inset).
2) A stroke above the active tab, painted by TabStyleViews, which (along with the active tab background) is layered over the straight underline.

The underline is still missing the following polish:
- Half-rounded edges.
- Potential redesign of the stroke above the active tab.

Screenshots are in the attached bug.

Bug: 905491
Change-Id: I4a99a67f9637b8a879bba7589feb848edb30deee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1809546
Commit-Queue: Connie Wan <connily@chromium.org>
Reviewed-by: Taylor Bergquist <tbergquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697805}