| Flutter macOS Embedder |

- DISTRIBUTE_NOTIFICATION : FlutterAppLifecycleDelegate.mm
- FLUTTER_ASSERT_ARC : FlutterMacros.h
- FLUTTER_ASSERT_NOT_ARC : FlutterMacros.h
- FLUTTER_DARWIN_EXPORT : FlutterMacros.h
- FLUTTER_DEPRECATED : flutter_macros.h , FlutterMacros.h
- FLUTTER_EXPORT : flutter_export.h
- FLUTTER_UNAVAILABLE : FlutterMacros.h
- NS_ASSUME_NONNULL_BEGIN : FlutterMacros.h
- NS_ASSUME_NONNULL_END : FlutterMacros.h
- OBSERVE_NOTIFICATION : FlutterAppLifecycleDelegate.mm
- VERIFY_DOWN : FlutterKeyboardManagerTest.mm