Roll engine 0345967a1964..5f03c7e35d71 (3 commits) (#39074)

git@github.com:flutter/engine.git/compare/0345967a1964...5f03c7e35d71

git log 0345967a1964..5f03c7e35d71 --no-merges --oneline
2019-08-22 stuartmorgan@google.com Use of App.framework in macOS FlutterDartProject (flutter/engine#11380)
2019-08-22 bkonyi@google.com Roll src/third_party/dart 9fda4c1101..88c0c11612 (12 commits)
2019-08-22 skia-flutter-autoroll@skia.org Roll src/third_party/skia c071fc92cd3d..068af9e416cb (3 commits) (flutter/engine#11379)

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https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

If the roll is causing failures, please contact the current sheriff (liyuqian@google.com), and stop
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bin/internal/engine.version

-0345967a1964eb2c3acc2ee70661ce28209436f9
+5f03c7e35d712690a4fa383791ee974729bcdf96