[HarfBuzz] Font sanitizing support in Harfbuzz

[GD dev]

Hi All,

Please correct me if I am wrong. My understanding is that harfbuzz
internally does font sanitization to rule out malicious fonts.

Now, we have platform libs that would use harfbuzz but some might decide to
do their own shaping, in which case, could they use harfbuzz just for font
sanitization. Also, how does harfbuzz' font sanitization support compare to
the one provided by "Sanitiser for OpenType" library from Chromium (
https://code.google.com/p/ots/wiki/DesignDoc).

Regards,
Gauravdeep Kamboj
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