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Currently if Tab Scrolling is enabled the TabStrip is allowed to grow
beyond the visible bounds of the TabStripRegionView with the help of
a ScrollView.

Existing caption hit testing uses the TabStrip view to determine
whether a rect or point belongs to the caption area. This results in
a bug where areas of the browser window are no longer recognized as
part of the caption area.

This is due to the non-visible parts of the TabStrip continuing to
contribute to the hit testing logic as it overflows.

This patch updates the TabStripRegionView to support the necessary
hit testing logic and ensure that only the visible portion of the
TabStrip is used.

Bug: 1129703

Change-Id: I49ccf9ba573afba84921a66249ef38723787cbba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2411704
Commit-Queue: Thomas Lukaszewicz <tluk@chromium.org>
Reviewed-by: Taylor Bergquist <tbergquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808579}