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Renaming the function to a generic name. The function will be used by
other nodes, namely highlights, to add text as a children.

Bug: 1008775
Change-Id: I30bc8dee91c72867b7933c77847b6d11cce0be7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903123
Commit-Queue: Ankit Kumar 🌪️ <ankk@microsoft.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#718105}