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Add accessibility support for pedals and dedicated row. Updated
announcements for normal state to include information about available
actions (pedals, search, switch to tab). If there are multiple actions
available, they aren't read individually but suggestion to iterate over
them is read. Added announcements for pedal buttons and search button
when they are focused. Message for focused pedals doesn't include
information about suggestion because the suggestion information doesn't
contain any additional information about pedal.

Bug: 1104264
Change-Id: I740afef8c8bc39cadd4ca5f5d5d263f4481d32af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339626Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Commit-Queue: Olesia Marukhno <olesiamarukhno@google.com>
Cr-Commit-Position: refs/heads/master@{#796942}