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This patch implements |TextType()| and its utility functions
for |NGFragmentItem|. This fixes symbol marker and other
painting failures due to incorrect |TextType()|.

Only one is removed from FlagExpectation because the bot is
not ready yet. I will clean it up once the bot is ready.

Bug: 982194
Change-Id: Ic99c9eb564b002682fefdb590d42679dbedeae60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865738Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707053}