guard rasterizer and drawlooper setters

Need to land https://codereview.chromium.org/1823513002/ first

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1821533002

Review URL: https://codereview.chromium.org/1821533002
diff --git a/public.bzl b/public.bzl
index 5729be8..11a7ca3 100644
--- a/public.bzl
+++ b/public.bzl
@@ -523,6 +523,7 @@
     # Chrome DEFINES.
     "SK_USE_FLOATBITS",
     "SK_USE_FREETYPE_EMBOLDEN",
+    "SK_SUPPORT_LEGACY_MINOR_EFFECT_PTR",
     "SK_SUPPORT_LEGACY_PATHEFFECT_PTR",
     # Turn on a few Google3-specific build fixes.
     "GOOGLE3",