Add SK_SUPPORT_LEGACY_THREADED_DAA_BUGS

Change-Id: I41d086b4f3754d08c1cb8952a9f0da35cd170a43
Reviewed-on: https://chromium-review.googlesource.com/1013609Reviewed-by: Leon Scroggins <scroggo@chromium.org>
Commit-Queue: Yuqian Li <liyuqian@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550997}

skia/config/SkUserConfig.h

@@ -229,6 +229,10 @@ SK_API void SkDebugf_FileLine(const char* file, int line, bool fatal,
 #define SK_SUPPORT_LEGACY_PATH_DAA_BIT
 #endif
 
+#ifndef SK_SUPPORT_LEGACY_THREADED_DAA_BUGS
+#define SK_SUPPORT_LEGACY_THREADED_DAA_BUGS
+#endif
+
 ///////////////////////// Imported from BUILD.gn and skia_common.gypi
 
 /* In some places Skia can use static initializers for global initialization,