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Chromecast should focus on the full screen shell surface node
that holds the child tree for the UI.  Otherwise, things like
live regions will fail to find a focused root node and will
not work.

Bug: NONE
Test: Local chromecast build
Change-Id: I5b34eb40fd3c7240b8584fc83bf312727f9e2658
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2134568Reviewed-by: Sean Topping <seantopping@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Randy Rossi <rmrossi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758839}