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The Switch Access feature on Chrome OS needs to explicitly control
scrollable containers. Expose the current scroll position via
GetAccessibleNodeData, and implement the required accessible actions
to set the scroll offset or scroll by one page in any direction.

Bug: 1108941
Change-Id: Icaf36b762b6651f04feb497012d7a029d87062ad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2319545
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Reviewed-by: Anastasia Helfinstein <anastasi@google.com>
Cr-Commit-Position: refs/heads/master@{#792822}