SkShaper/public.bzl fix

Change-Id: Ie9a0b03cdc3e683689d8d8d078cf382adc101021
Reviewed-on: https://skia-review.googlesource.com/c/194423
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
diff --git a/public.bzl b/public.bzl
index 76ea8bd..00f637b 100644
--- a/public.bzl
+++ b/public.bzl
@@ -690,6 +690,7 @@
     "modules/skshaper/include/SkShaper.h",
     "modules/skshaper/src/SkShaper.cpp",
     "modules/skshaper/src/SkShaper_harfbuzz.cpp",
+    "modules/skshaper/src/SkShaper_primitive.cpp",
 ]
 
 SKSHAPER_PRIMITIVE_SRCS = [