Merges the current flutter-desktop-embedding macOS framework into the engine. Notable changes: - All channel/codec related code is eliminated in favor of using the existing iOS implementations. - All .m files renamed to .mm for consistency with the iOS code. - Some minor code changes to fix new warnings in Objective-C++ mode. - License headers, basic format (e.g., clang-format changes) updated to use repo style. - Xcode project is not included; instead adds GN build rules to create an integrated framework that combines what was the FDE library with what is present in FlutterEmbedder.framework. Other changes are left as follow-ups, including: - Moving shared code out of ios/ into common/. - Potentially improving sharing between iOS and macOS BUILD.gn. - Class renaming; the FLE prefix will be eliminated, but that API surface isn't stable yet, so that can be changed later.
Flutter Engine
Flutter is a new way to build high-performance, cross-platform mobile apps. Flutter is optimized for today's, and tomorrow's, mobile devices. We are focused on low-latency input and high frame rates on Android and iOS.
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.
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