skia config SK_SUPPORT_LEGACY_BITMAP_SETPIXELREF

upcoming CL: https://review.skia.org/5461

Review-Url: https://codereview.chromium.org/2564103002
Cr-Commit-Position: refs/heads/master@{#437611}

skia/config/SkUserConfig.h

@@ -236,6 +236,10 @@ SK_API void SkDebugf_FileLine(const char* file, int line, bool fatal,
 #   define SK_SUPPORT_LEGACY_CLIPOPS_PLAIN_ENUM
 #endif
 
+#ifndef    SK_SUPPORT_LEGACY_BITMAP_SETPIXELREF
+#   define SK_SUPPORT_LEGACY_BITMAP_SETPIXELREF
+#endif
+
 ///////////////////////// Imported from BUILD.gn and skia_common.gypi
 
 /* In some places Skia can use static initializers for global initialization,