Add SK_SUPPORT_LEGACY_2PT_CONICAL

Change-Id: Ia08c56f2d1337ee23c7fd9423d021d93f78dbbbb
Reviewed-on: https://chromium-review.googlesource.com/848089
Commit-Queue: Yuqian Li <liyuqian@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526996}

skia/config/SkUserConfig.h

@@ -241,6 +241,10 @@ SK_API void SkDebugf_FileLine(const char* file, int line, bool fatal,
 #define SK_SUPPORT_LEGACY_CONTAINED_IN_CLIP
 #endif
 
+#ifndef SK_SUPPORT_LEGACY_2PT_CONICAL
+#define SK_SUPPORT_LEGACY_2PT_CONICAL
+#endif
+
 ///////////////////////// Imported from BUILD.gn and skia_common.gypi
 
 /* In some places Skia can use static initializers for global initialization,