add flag for future skia cl

bug: skia:8527
Change-Id: I44de70acf82680d1a446c1c1a811c34322e047d9
Reviewed-on: https://chromium-review.googlesource.com/c/1320514
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606068}

skia/config/SkUserConfig.h

@@ -139,6 +139,10 @@ SK_API void SkDebugf_FileLine(const char* file, int line, bool fatal,
 #   define SK_SUPPORT_LEGACY_ANISOTROPIC_MIPMAP_SCALE
 #endif
 
+#ifndef SK_SUPPORT_LEGACY_NONCLASS_HINTINGENUM
+#define SK_SUPPORT_LEGACY_NONCLASS_HINTINGENUM
+#endif
+
 // Remove this after we fixed all the issues related to the new SDF algorithm
 // (https://codereview.chromium.org/1643143002)
 #ifndef SK_USE_LEGACY_DISTANCE_FIELDS