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This CL is replacing the control characters with the "Replacement Codepoints".

The codepoints in that area are:

  Unicode Character Category 'Other, Control'
  a) u+0000 -> u+001f
  b) u+007f   (delete)
  c) 0080 -> 009f

The codepoints from a) and b) are already handled properly.

For codepoints from c), it is quite common to have no glyphs (win7).

"""
  Most of these characters play no explicit role in Unicode text handling.
  The characters U+0000 <control-0000> (NUL), U+0009 <control-0009> tab key (HT),
  U+000A <control-000A> newline (LF), U+000D <control-000D> (CR), and
  U+0085 <control-0085> (NEL) are commonly used in text processing as formatting
  characters.
"""


see: https://en.wikipedia.org/wiki/Unicode_control_characters
Bug: 1011818
Change-Id: I23010faf9130806db3884720e4a90c0723802893
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894041
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#711465}