Added docs on accessibility tests

Added docs on accessibility tests

BUG=none
NOTRY=true
TBR=nektar@chromium.org

Review-Url: https://codereview.chromium.org/2728663004
Cr-Commit-Position: refs/heads/master@{#454197}
Committed: https://chromium.googlesource.com/chromium/src/+/9cd1712465e607972bae01b8d3aaadcec75bd106

[dmazzoni, 2017-03-02 06:51:19]

The CQ bit was checked by dmazzoni@chromium.org

[commit-bot: I haz the power, 2017-03-02 06:52:02]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-03-02 06:58:50]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1488437479158370, "parent_rev":
"59ed1a91fda8e9ebe134af745d5ef9fc9ec4167a", "commit_rev":
"9cd1712465e607972bae01b8d3aaadcec75bd106"}

[commit-bot: I haz the power, 2017-03-02 06:59:27]

Description was changed from

==========
Added docs on accessibility tests

BUG=none
NOTRY=true
TBR=nektar@chromium.org
==========

to

==========
Added docs on accessibility tests

BUG=none
NOTRY=true
TBR=nektar@chromium.org

Review-Url: https://codereview.chromium.org/2728663004
Cr-Commit-Position: refs/heads/master@{#454197}
Committed:
https://chromium.googlesource.com/chromium/src/+/9cd1712465e607972bae01b8d3aa...
==========

[commit-bot: I haz the power, 2017-03-02 06:59:28]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/9cd1712465e607972bae01b8d3aa...