Revert concave AAA

BUG=skia:6131
TBR=reed@google.com,caryclark@google.com

Change-Id: Ib580a4fb9023f43518a3d89cd70bf2589ad02bb6
Reviewed-on: https://skia-review.googlesource.com/7200
Commit-Queue: Yuqian Li <liyuqian@google.com>
Reviewed-by: Yuqian Li <liyuqian@google.com>
diff --git a/src/core/SkAnalyticEdge.h b/src/core/SkAnalyticEdge.h
index c70772d..e2a9867 100644
--- a/src/core/SkAnalyticEdge.h
+++ b/src/core/SkAnalyticEdge.h
@@ -10,6 +10,11 @@
 
 #include "SkEdge.h"
 
+// Use this to check that we successfully guard the change against Chromium layout tests
+#ifndef  SK_SUPPORT_LEGACY_AAA
+# define SK_SUPPORT_LEGACY_AAA
+#endif
+
 struct SkAnalyticEdge {
     // Similar to SkEdge, the conic edges will be converted to quadratic edges
     enum Type {
diff --git a/src/core/SkScan.h b/src/core/SkScan.h
index c995542..d0c10fa 100644
--- a/src/core/SkScan.h
+++ b/src/core/SkScan.h
@@ -23,6 +23,11 @@
 */
 typedef SkIRect SkXRect;
 
+// Use this to check that we successfully guard the change against Chromium layout tests
+#ifndef  SK_SUPPORT_LEGACY_AAA
+# define SK_SUPPORT_LEGACY_AAA
+#endif
+
 extern std::atomic<bool> gSkUseAnalyticAA;
 extern std::atomic<bool> gSkForceAnalyticAA;