guard for upcoming skia/skcms perf tweaks

See https://skia-review.googlesource.com/c/skia/+/123181

Change-Id: I5cfc3f2f3031d1d30f85cc96bf73c1d243a15606
Reviewed-on: https://chromium-review.googlesource.com/1024692
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552883}

skia/config/SkUserConfig.h

@@ -231,6 +231,9 @@ SK_API void SkDebugf_FileLine(const char* file, int line, bool fatal,
 #define SK_SUPPORT_LEGACY_THREADED_DAA_BUGS
 #endif
 
+#define SK_DONT_OPTIMIZE_SRC_PROFILES_FOR_SPEED
+#define SK_DONT_OPTIMIZE_DST_PROFILES_FOR_SPEED
+
 ///////////////////////// Imported from BUILD.gn and skia_common.gypi
 
 /* In some places Skia can use static initializers for global initialization,