Manual roll of Dart 617bc54b71...39e0e75fcf (#18215)

This roll unforks the Dart SDK to use the non nullable SDk,
the engine platform file is built with all the dart:* libraries
opted in except for dart:ui

dart-lang/sdk@617bc54b71 [dart2js] unit test patch for unfork cl.
dart-lang/sdk@ce5d18b0f0 [CFE] - Update exectations of CFE unit tests to account for NNBD unfork
dart-lang/sdk@be0c78a7cc [dart2js] Fix platform-binaries on bots.
dart-lang/sdk@03ce33f80c [BUILD] - Initial CL to unfork the NNBD Dart SDK
5 files changed
tree: 44182c48c0ec36ee24bab99231ee8ed467a3f14e
  1. .github/
  2. assets/
  3. benchmarking/
  4. build/
  5. ci/
  6. common/
  7. docs/
  8. e2etests/
  9. examples/
  10. flow/
  11. flutter_frontend_server/
  12. fml/
  13. lib/
  14. runtime/
  15. shell/
  16. sky/
  17. testing/
  18. third_party/
  19. tools/
  20. vulkan/
  21. web_sdk/
  22. .cirrus.yml
  23. .clang-format
  24. .gitattributes
  25. .gitignore
  26. analysis_options.yaml
  27. AUTHORS
  28. BUILD.gn
  29. CONTRIBUTING.md
  30. DEPS
  31. Doxyfile
  32. LICENSE
  33. README.md
README.md

Flutter Engine

Build Status - Cirrus

Flutter is Google's mobile app SDK for crafting high-quality native interfaces in record time. Flutter works with existing code, is used by developers and organizations around the world, and is free and open source.

The Flutter Engine is a portable runtime for hosting Flutter applications. It implements Flutter's core libraries, including animation and graphics, file and network I/O, accessibility support, plugin architecture, and a Dart runtime and compile toolchain. Most developers will interact with Flutter via the Flutter Framework, which provides a modern, reactive framework, and a rich set of platform, layout and foundation widgets.

If you are new to Flutter, then you will find more general information on the Flutter project, including tutorials and samples, on our Web site at Flutter.dev. For specific information about Flutter's APIs, consider our API reference which can be found at the docs.flutter.dev.

Flutter is a fully open source project, and we welcome contributions. Information on how to get started can be found at our contributor guide.