add some lowp gradient stages

I was originally going to add these to help test a lowp dither, but
after looking at diffs I don't think lowp dither is a good idea.

Non-dithered lowp gradients look fine to me so far.

I'd have done conics, but they scare me.

Change-Id: I8f5e75aec726983186214845ca38cfa0d54496b3
Reviewed-on: https://skia-review.googlesource.com/66460
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>

1 files changed, 0 insertions, 1 deletions

diff --git a/gn/gm.gni b/gn/gm.gni
index 27b92a9d83..441c041e6f 100644
--- a/gn/gm.gni
+++ b/gn/gm.gni
@@ -102,7 +102,6 @@ gm_sources = [
   "$_gm/discard.cpp",
   "$_gm/displacement.cpp",
   "$_gm/distantclip.cpp",
-  "$_gm/dither.cpp",
   "$_gm/downsamplebitmap.cpp",
   "$_gm/draw_bitmap_rect_skbug4374.cpp",
   "$_gm/drawable.cpp",