Rename UseRasterPipelineBlitter to UseLegacyBlitter.

This function was misleadingly named. It is meant to detect the cases
where we still want to use the legacy blitter; it does not actually
detect that we want to use the raster pipeline. Raster pipeline usage
is determined later by `create_SkRP_or_SkVMBlitter`.

The name probably made more sense before SkVMBlitter was introduced,
when the only two choices were "RasterPipeline" or "Legacy."

Change-Id: I4ed80e5d49a23ed22b3d34eb8a707cd752b5cc5d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/418143
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2 files changed