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This change adds an output rule for the mark role.
If needed, follow-up patches can build off of this change to support
associated aria-details elements. We also add tests to confirm
behavior, using sample code provided by the Docs team.

This change also adds a check for non-existent braille strings in
Msgs.getMsg(), since ChromeVox hits the following error without it:

"Invalid ChromeVox message id: role_content_insertion_brl"

'marked content'.

Fixed: 1126131
Change-Id: If588b3d018ddcab272a265bb63eb4c6119352781
AX-Relnotes: ChromeVox announces elements with role=mark as
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422252
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819455}