This mechanically replaces kXXX_SkTextEncoding with SkTextEncoding::kXXX
and kXXX_SkFontHinting with SkFontHinting::kXXX. This will allow Skia to
remove these old macro constants and get everyone on the new enums.
Flow is a simple compositor based on Skia that the Flutter engine uses to cache
recoded paint commands and pixels generated from those recordings. Flow runs on
the GPU thread and uploads information to the GPU.