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This is a reland of cb9c3091

TBR=afakhry@chromium.org,dmazzoni@chromium.org,sky@chromium.org

Original change's description:
> Adds code in ViewAccessibility to manage the focus of AXVirtualView descendants
>
> Also renamed some methods to make interface more consistent.
> In preparation for more changes in AXVirtualView.
> R=dmazzoni@chromium.org, aleventhal@chromium.org
>
> Change-Id: Ib417493794cc16536e20c3ce72dc8b00ba8568a9
> Reviewed-on: https://chromium-review.googlesource.com/c/1296621
> Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
> Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Commit-Queue: Nektarios Paisios <nektar@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#602876}

Change-Id: I08aa777df2ce4a7fc93e30e00ef4aced623fdd6e
Reviewed-on: https://chromium-review.googlesource.com/c/1301796
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603148}