logical fontID.
Extend ImageRef to accept an imagedecoder factory, to replace calling the std
one.
git-svn-id: http://skia.googlecode.com/svn/trunk@125 2bbb7eff-a529-9590-31e7-b0007b416f81
skia std. of receiver calls ref() if it needs to, but regardless, the caller
always manages/balances its own ownership.
git-svn-id: http://skia.googlecode.com/svn/trunk@121 2bbb7eff-a529-9590-31e7-b0007b416f81