Introduce new factory for SkColorFilters

Idea: transition callers to this, so we can later typedef SkColorFilter
and SkShader to the same thing.

Bug: skia:8937
Change-Id: I000c882e11622091aa44c141aa6ddd1216414f46
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/206685
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/gm/drawatlas.cpp b/gm/drawatlas.cpp
index ec9ef05..5dafab4 100644
--- a/gm/drawatlas.cpp
+++ b/gm/drawatlas.cpp
@@ -270,7 +270,7 @@
     auto verts = make_vertices(image, tex, color);
     const sk_sp<SkColorFilter> filters[] = {
         nullptr,
-        SkColorFilter::MakeModeFilter(0xFF00FF88, SkBlendMode::kModulate),
+        SkColorFilters::Blend(0xFF00FF88, SkBlendMode::kModulate),
     };
     const SkBlendMode modes[] = {
         SkBlendMode::kSrcOver,