Reland "Reland "Fix blurry edges on large ovals.""

This is a reland of 4dd7c1dae12c8e3b0d7777910b9ab8b29efe5ebf

Original change's description:
> Reland "Fix blurry edges on large ovals."
> 
> This is a reland of c7aed036c341eff661de2ccc3a728a9b68635159
> 
> Changes the precision for the GrOvalOpFactory shaders to be float rather than half.
> In the medium-precision case, adds a scale factor to the shaders to ensure that the
> denominator of the distance calculation stays within range. If enough precision isn't
> available, falls back to a path renderer.
> 
> Original change's description:
> > Fix blurry edges on large ovals.
> >
> > Changes the precision for the GrOvalOpFactory shaders to be float rather than half. In the
> > low-precision case, it falls back to a path renderer for large ovals.
> >
> > Bug: b/110380864, skia:8873
> > Change-Id: I89e8dd067a2e0cab35b1bb515adaab4a2fb4f222
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/201615
> > Commit-Queue: Jim Van Verth <jvanverth@google.com>
> > Reviewed-by: Brian Salomon <bsalomon@google.com>
> 
> Bug: b/110380864, skia:8873
> Change-Id: Ic72d819f589ffebf9c5250bb4df4de22ab23f282
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/202718
> Reviewed-by: Brian Osman <brianosman@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Jim Van Verth <jvanverth@google.com>

Bug: b/110380864, skia:8873
Change-Id: I026d943f4ac005e04ef7350c5af67fda6865ae92
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/203729
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
(cherry picked from commit 20ae25ce11f74753ed042295b3b7016e3460a404)
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/204768
Auto-Submit: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
8 files changed