Expose Android accessibility focus to Blink accessibility internals

Bug: 841218
TBR=michaelpg@chromium.org

Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Iaea99a1a18c1eea7d1480b68b4a1aa71448d09d1
Reviewed-on: https://chromium-review.googlesource.com/1050498
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559203}
17 files changed