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Previous to this change, neither the tabbed pane itself nor its contents
pane would report a meaningful accessible name/title. When using
accessible keyboard navigation (tab, arrows) to navigate a dialog that
had a tabbed pane (such as the site cookies dialog), when entering the
tabbed pane a screen reader user would simply hear "tabbed pane", and
when using the arrow keys to select the tab, the user would hear the
(unspecified) accessible title of the pane view inside the tab, which
was usually just "pane" or nothing at all.

This CL makes the following changes:
 - the title of the entire TabbedPane now reflects the currently active
   tab title
 - by default, the contents pane of each tab is assigned the same
   accessible name/title and role as the tab (it can be overridden later
   if necessary)

Now, for example, when using NVDA, when the user first enters the
cookies dialog, they hear: "allowed tab control". When navigating
between tabs using the arrow keys, they will continue to hear "allowed
tab" and "blocked tab" as they switch back and forth.

Bug: 962966
Change-Id: I805281bf5429e03ca77f98e167041a5df3cbee8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1717228Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Commit-Queue: Dana Fried <dfried@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680630}