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This CL updates the behavior of ToggleButton on Android.

With this change, the state of a ToggleButton ("On"/"Off")
will now be read during swipe navigation when a node is
initially selected. Until now the state of the toggle button
has only been announced during a toggle action.

We append the state of the Toggle in the stateDescription
element of the node's corresponding AccessibilityNodeInfo
object.

This CL also updates associated unit test expectations.


AX-Relnotes: ToggleButtons on Android now explicitly announce their state.
Bug: 1121743
Change-Id: Iaa25379fa9c478c6c96c9a58d99495a8a8fe978f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432211Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Mark Schillaci <mschillaci@google.com>
Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: Mark Schillaci <mschillaci@google.com>
Cr-Commit-Position: refs/heads/master@{#811759}