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The PUA (Private Use Areas) codepoints are not assigned by unicode.
They can be used with an hardcoded font to display custom made glyphs.
This feature is not used in chrome and will lead to fallback fonts.

based on https://chromium-review.googlesource.com/c/chromium/src/+/829378
see http://crbug.com/795225


see: https://en.wikipedia.org/wiki/Private_Use_Areas
Bug: 1018378
Change-Id: I4b218336dba859eda2729bc9668d866e4ec03211
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1887531
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Dominik Röttsches <drott@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711257}