Assert complex precondition in SkGlyphCache::Visit.

SkGlyphCache::Visit takes a descriptor and a typeface, but it is implied
that the fFontID in the descriptor is the id of the typeface. This seems
to be handled correctly by current callers but this is a subtle
requirement which if violated could lead to subtle bugs.

Review-Url: https://codereview.chromium.org/1992053002
1 file changed