GitLab

Boiler plate setup to enable tests for TabStripRegionView with and
without scrolling.

Added one test for scrolling to ensure the TabStrip can grow larger than
its parent.

Bug: 1141674
Change-Id: I7ae9ba8a1f6b8f2f8f899002dcea51cc1c64edd4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2493483
Commit-Queue: Charlene Yan <cyan@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822854}