Use the Read/WriteBuffer bulk API for points

In the TransformedMaskVertexFiller, use the bulk API for reading
and writing SkPoints. This should now be the same as the
DirectMaskSubRun code. Next CL will be to extract the common code.

Change-Id: If7592e4dc876a96c69086a0b04fbc88acadc76a6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/565013
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Herb Derby <herb@google.com>
1 file changed