Fix precision caps and rrect/ellipse effect precisions

Replaces all the complex precision caps with a single flag that says
whether "float" == fp32. Updates the ellipse and rrect effects to
use float coords, and use the scale workaround when float != fp32.

Bug: skia:7190
Change-Id: Ieccff9f38acd05e5cec78fe90d01a5da901a9307
Reviewed-on: https://skia-review.googlesource.com/70961
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
17 files changed