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This CL updates the behavior of ListBox on Android.

With this change, the state of a Listbox ("x items") will
now be read during swipe navigation when a node is initially
selected. For ListBoxItem, the state of the item will read
as "in list, item x of y".

We append the state of the ListBox or items in the
stateDescription element of the node's corresponding
AccessibilityNodeInfo object.

This CL also updates associated unit test expectations.


AX-Relnotes: ListBoxes and ListBoxItems now explicitly announce their count and item index.
Bug: 1101656
Change-Id: I41bf46d2f11ea9fb0c744ccd3802855c028ecb79
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436382
Commit-Queue: Mark Schillaci <mschillaci@google.com>
Reviewed-by: Mark Schillaci <mschillaci@google.com>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812477}