add flag to disable new arcTo code (until we rebaseline)

skia/config/SkUserConfig.h

 /*
  * Copyright (C) 2006 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
@@ skipping 239 matching lines @@
 #endif
 
 #ifndef    SK_IGNORE_ETC1_SUPPORT
 #   define SK_IGNORE_ETC1_SUPPORT
 #endif
 
 #ifndef    SK_IGNORE_GPU_DITHER
 #   define SK_IGNORE_GPU_DITHER
 #endif
 
+#ifndef SK_SUPPORT_LEGACY_ARCTO_QUADS
+#   define SK_SUPPORT_LEGACY_ARCTO_QUADS
+#endif
+
 #ifndef SK_SUPPORT_LEGACY_ADDOVAL
 #   define SK_SUPPORT_LEGACY_ADDOVAL
 #endif
 
 #ifndef SK_SUPPORT_LEGACY_ADDRRECT
 #   define SK_SUPPORT_LEGACY_ADDRRECT
 #endif
 
 // If this goes well, we can have Skia respect DYNAMIC_ANNOTATIONS_ENABLED directly.
 #if DYNAMIC_ANNOTATIONS_ENABLED
 #    define SK_DYNAMIC_ANNOTATIONS_ENABLED 1
 #endif
 
 // ===== End Chrome-specific definitions =====
 
 #endif