Roll engine cdaf44265b74..4f00cb745c28 (2 commits) (#38570)

git@github.com:flutter/engine.git/compare/cdaf44265b74...4f00cb745c28

git log cdaf44265b74..4f00cb745c28 --no-merges --oneline
2019-08-14 dnfield@google.com Add script for running ios Tests on simulator (flutter/engine#10999)
2019-08-14 jason-simmons@users.noreply.github.com Avoid dynamic lookups of the engine library's symbols on Android (flutter/engine#11001)

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bin/internal/engine.version

-cdaf44265b74211176b4571bb28bd546ed78c352
+4f00cb745c2895feb47985725f8ada94df72ce36