Skia minor version tracks milestone release branch

include/core/SkTypes.h

Index: include/core/SkTypes.h
diff --git a/include/core/SkTypes.h b/include/core/SkTypes.h
index b9e519195598de44a66a0b407984c2410ed2d30b..0ed6816c46b03e7fc908e35850e2aeccb9355d65 100644
--- a/include/core/SkTypes.h
+++ b/include/core/SkTypes.h
@@ -55,6 +55,8 @@ static inline void* sk_careful_memcpy(void* dst, const void* src, size_t len) {
 #define SKIA_VERSION_MINOR  0
 #define SKIA_VERSION_PATCH  0
 
+#define SKIA_MILESTONE 51
+
 /*
     memory wrappers to be implemented by the porting layer (platform)
 */