Roll engine f3a3d0ce7f0b..57fd394e59b8 (1 commits) (#22176)

https://github.com/flutter/engine/compare/f3a3d0ce7f0b...57fd394e59b8

git log f3a3d0ce7f0b..57fd394e59b8 --no-merges --oneline
57fd394e5 Ensure that objects on stack that close traces have unique variable names. (flutter/engine#6298)


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bin/internal/engine.version

-f3a3d0ce7f0b54a49b60dc431ebe5292e92f78bf
+57fd394e59b81262b6c74c97c15d159befd6a3a7