2pt conical stage for focal-point-outside case

A couple of annoyances here:

1) the prev vector_scale stage is not usable for masking, as NaN values can propagate through
   => switch to actual masking

2) for the outside case, we must select the min root when the gradient is flipped
   => split into two templated stages (_min, _max)

  (I'm not convinced that we need to flip the gradient for RP at all; we can investigate later)

Change-Id: I0283812d613a53124f2987d1aea1f26e4533655e
Reviewed-on: https://skia-review.googlesource.com/21162
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>

0 files changed, 0 insertions, 0 deletions