RTL handling for ghost runs, NotoNaskhArabic test font (#8638)

https://dart.googlesource.com/external/github.com/flutter/engine/+/6e79dcd0cfd9df08b4240a5aa158659c34e4154f
diff --git a/commits.json b/commits.json
index 0c0dbe2..4071541 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
-  "external/github.com/flutter/engine":"c37d4598190b61f83d8eee828d322fc8f6272dd6",
+  "external/github.com/flutter/engine":"6e79dcd0cfd9df08b4240a5aa158659c34e4154f",
   "external/github.com/flutter/flutter":"0545c63b9baca0d40c2126dba6366fad2b16d3c1",
   "sdk":"76f177a49257056adc92d715ad3a0cc0eae16633"
 }
\ No newline at end of file