read/write sfnt-data length, to match convetion of other fonthosts.
read/write sfnt-data length, to match convetion of other fonthosts.

TODO: move that "convention" into shared code (SkTypeface.cpp or SkFontHost.cpp)
and just require each port to support:

1. typeface <--> descriptor
2. typeface_raw_data <--> stream (possibly with algo-style flags)



git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@4125 2bbb7eff-a529-9590-31e7-b0007b416f81

hbwhlklive/color-emoji.skia,Hankuo/color-emoji.skia,MatChung/color-emoji.skia,MatChung/color-emoji.skia,Hankuo/color-emoji.skia,MatChung/color-emoji.skia,Frankie-666/color-emoji.skia,MatChung/color-emoji.skia,Frankie-666/color-emoji.skia,hbwhlklive/color-emoji.skia,MatChung/color-emoji.skia,Frankie-666/color-emoji.skia,Frankie-666/color-emoji.skia,hbwhlklive/color-emoji.skia,Hankuo/color-emoji.skia,hbwhlklive/color-emoji.skia,Hankuo/color-emoji.skia,Hankuo/color-emoji.skia,hbwhlklive/color-emoji.skia,Frankie-666/color-emoji.skia,MatChung/color-emoji.skia,Frankie-666/color-emoji.skia,hbwhlklive/color-emoji.skia,Hankuo/color-emoji.skia