There is somewhat simple support for this in Skia with
SkFontMgr::matchFamilyStyleCharacter. Note that this is what
FontMgrRunIterator::consume currently uses to do font fallback.
Different platforms handle font fallback and matching in different
ways ways, though recently it may be possible to provide a bit better
implementation in Skia which could be supported cross platform. The
main issue here is that it is fairly time consuming to go through a
collection of fonts and extract the character map information, so
every platform tries to cache this information as much as possible.
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