20745 Revert “Enable hybrid composition by default on Android” (cla: yes, platform-android)

20746 Revert hint_freed (cla: yes)

20747 [web] Make word boundary consistent with native flutter (cla: yes, platform-web)

20750 Image.toByteData and Picture.toImage implementations (#3) (cla: yes)

20754 Use hint freed specifically for image disposal (cla: yes)

20758 Manual roll of Dart from 5ca1f32905 to 551e405d0b (cla: yes)

20760 Default C++ wrapper templates to EncodableValue (affects: desktop, cla: yes, platform-windows)