In particular, linear metrics now means 'linearly scalable metrics' as
expected. This also makes the documentation for the setter and getter
for subpixel positioning agree.
Change-Id: I08f5009f32516a0fdaecefc1d7dbe5f43c005a69
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/212406
Reviewed-by: Mike Reed <reed@google.com>
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
07dad1bc42