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The CL is fixing a bug when the rewriting loop iterate through
the input text. If the codepoint is updated with a larger codepoint,
the next_offset was not updated properly and was pointing in the middle
of the surrogate pair. This was not happening since only the PUA
codepoints were producing larger characters.

Change-Id: I4c6eea9a1a02374d04a0271bd4d6140e123069ba
Bug: 4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1903808Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713491}