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This CL updates our approach to the state description
member variable of AccessibilityNodeInfo objects on Android.
Until now we have picked a single state description based
on the node. With this change we now concatenate all
potential state descriptions to make sure no information is
lost on mixed nodes (e.g. multiselectable listBox).

We added a few exceptions to concatenation, namely the case
of a multiselectable listbox will not announce the number of
items in the list when some are selected. This is to prevent
an utterance like:

"multiselectable, 2 of 4 selected. 4 items"

Instead in the case of a multiselectable listbox, it will be
read as either:

"multiselectable, none selected. 4 items"
or
"multiselectable, 2 of 4 selected."

Similarly, we make toggle buttons and partially checked
checkboxes mutually exclusive to prevent double speak.

As of now all other cases are simply concatenated.


AX-Relnotes: N/A
Change-Id: I5650230b141cae24dfd935be596fb14720b723ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2476520Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Mark Schillaci <mschillaci@google.com>
Commit-Queue: Mark Schillaci <mschillaci@google.com>
Cr-Commit-Position: refs/heads/master@{#818000}