add guard for skia-review.googlesource.com/146522

Should be a good number of teensy layout test diffs.

Change-Id: I3dc74252fab7ec8ee4aa38d95ba1f60ed3e96b01
Reviewed-on: https://chromium-review.googlesource.com/1169313
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581950}

skia/config/SkUserConfig.h

@@ -197,6 +197,8 @@ SK_API void SkDebugf_FileLine(const char* file, int line, bool fatal,
 #define SK_SUPPORT_LEGACY_AAA_CHOICE
 #endif
 
+#define SK_LEGACY_CONVERT_PIXELS_IMPL
+
 ///////////////////////// Imported from BUILD.gn and skia_common.gypi
 
 /* In some places Skia can use static initializers for global initialization,