fix g3 by adding legacy flag

Bug: skia:7554
Change-Id: I0aa766f58719b29340e5b225c74781b9884f30f6
Reviewed-on: https://skia-review.googlesource.com/150242
Auto-Submit: Mike Reed <reed@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/public.bzl b/public.bzl
index 82502b4..ce74782 100644
--- a/public.bzl
+++ b/public.bzl
@@ -602,6 +602,7 @@
         # Required for building dm.
         "GR_TEST_UTILS",
         # Staging flags for API changes
+        "SK_SUPPORT_LEGACY_ONDRAWTEXTONPATH",
         # Should remove after we update golden images
         "SK_WEBP_ENCODER_USE_DEFAULT_METHOD",
         # Experiment to diagnose image diffs in Google3