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Will allow Select-to-speak panel UI to appear above focus ring and highlight layers. This also avoids the need to create more window containers.

Bug: 1143814
Change-Id: I1c4fce614404c6cabd0336eed2ab6fa7ac1d4c48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2568547
Commit-Queue: Joel Riley <joelriley@google.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833155}