Text level elements should participate in recursive name computation

Accessible name computation fails to pick up content of text level elements not listed elsewhere (refer to HTML-aam spec) when the elements are located in subtree of an element of name-from-content role

R=dmazzoni@chromium.org

Bug: 1053507
Change-Id: I702e04269ef298a16cb085b226709209a67517b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2068755
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Alexander Surkkov <asurkov@igalia.com>
Cr-Commit-Position: refs/heads/master@{#744929}
2 files changed