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Give the toolbar accessible node data so that it becomes a group in the
accessibility tree. This improves the experience of navigating the
chrome for screen reader users: users can treat the toolbar as a group
and interact with it, or skip over it if they prefer. Previously, users
had to navigate through every button in the toolbar, slowing them down.

Bug: 1097760
Change-Id: Ia7aaed4d74bf081c2b41e4142d732d8b56563afa
AX-Relnotes: Make the toolbar an accessible group.
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2588893
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836812}