Add legacy flag for emoji

Change-Id: Id7e99c8c05013e9d97ca68cdb5477468fcc8788f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1940667
Commit-Queue: Herb Derby <herb@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
Auto-Submit: Herb Derby <herb@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
Cr-Commit-Position: refs/heads/master@{#719671}

skia/config/SkUserConfig.h

@@ -226,6 +226,10 @@ SK_API void SkDebugf_FileLine(const char* file,
 #define SK_SUPPORT_LEGACY_AAA_CHOICE
 #endif
 
+#ifndef SK_SUPPORT_LEGACY_CPU_EMOJI
+#define SK_SUPPORT_LEGACY_CPU_EMOJI
+#endif
+
 // We're turning this off indefinitely,
 // until we can figure out some fundamental problems with its approach.
 //