[Sh-Clank] Added HIGHLIGHTED_TEXT content type

Bug: 1102382
Change-Id: I7a4bcfdf6ed30a3ff458f8b4c8e022a7daa2aa6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2311678


Commit-Queue: Gayane Petrosyan <gayane@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791494}