Flutter's accessibility APIs consist of three main calls from the
embedder to the Dart application:

  1. FlutterEngineUpdateSemanticsEnabled: enables/disables semantics support.

  2. FlutterEngineUpdateAccessibilityFeatures: sets embedder-specific
     accessibility features.

  3. FlutterEngineDispatchSemanticsAction: dispatches an action (tap,
     long-press, scroll, etc.) to a semantics node.

and two main callbacks triggered by Dart code:

  1. FlutterUpdateSemanticsNodeCallback: notifies the embedder of
     updates to the properties of a given semantics node.

  2. FlutterUpdateSemanticsCustomActionCallback: notifies the embedder
     of updates to custom semantics actions registered in Dart code.

In the Flutter framework, when accessibility is first enabled, the
embedder will receive a stream of update callbacks notifying the
embedder of the full semantics tree. On further changes in the Dart
application, only updates will be sent.