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Callers outside Tab only referred to the vertical insets, which are now either 0
or Tab::GetStrokeWidth(), a new function added for this purpose, depending on
the context.

Inside Tab this is subsumed into GetTabEndcapWidth(), which itself has been
split into two parts: a general-purpose routine and a pre-refresh-specific
"paint" width routine.  This may be cleaned up further depending on how I solve
narrow tabs in the end.

BUG=none
TEST=none

Change-Id: Ifca96b76b694f3f922e0252cf5198c7a9bb475e3
Reviewed-on: https://chromium-review.googlesource.com/1112773Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570168}