[Impeller] Reland "Add render target builder" (#36371)

https://dart.googlesource.com/external/github.com/flutter/engine/+/3a58a7d0105e48c324940bf7c67c7da2a4fb5716
diff --git a/commits.json b/commits.json
index 3a129c5..195b8fa 100644
--- a/commits.json
+++ b/commits.json
@@ -1,5 +1,5 @@
 {
-  "external/github.com/flutter/engine":"2c38fc5cb03f691ca9ac77664b3789dc5acf27f4",
+  "external/github.com/flutter/engine":"3a58a7d0105e48c324940bf7c67c7da2a4fb5716",
   "external/github.com/flutter/flutter":"73ac70b9fb920c6a65ed78a8deafb2a66bc2dc3e",
   "sdk":"cfddeee68e0cf7451a2eee1a9fbbff8a8d9c0b92"
 }
\ No newline at end of file