[dm] Use a specific pixel geometry for GraphiteSink

This is used by GPUSink and RasterSink as well, and is necessary for LCD
text to render correctly through DM.

Change-Id: Ifeeebd7da5af1474d13fbfcd0568f2f2bdef4a7f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/743416
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: James Godfrey-Kittle <jamesgk@google.com>
1 file changed