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This CL updates the behavior of Checkbox on Android.

With this change, the mixed state of a Checkbox will now
be announced during swipe navigation or when a node is
initially selected. Until now the mixed state has been
synonymous with false.

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

This CL also updates associated unit test expectations.


AX-Relnotes: Checkboxes on Android will now announce "partially checked" when in a mixed state
Bug: 1121750
Change-Id: Iec434d20b41ec71b4708b1815c78d3cf7b2497fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432089
Commit-Queue: Mark Schillaci <mschillaci@google.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Mark Schillaci <mschillaci@google.com>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812364}