37719 CupertinoDynamicColor and friends (cla: yes, f: cupertino, f: material design, framework)

37739 Fix AnimationStatus for repeat(reverse: true) and animateWith (a: animation, cla: yes, framework, severe: API break)

37819 Add HtmlElementView (the Flutter Web platform view) (cla: yes, framework, ☸ platform-web)

37832 add –exit and –match-host-platform defaults to devicelab runner (cla: yes, team, tool)

37845 echo error messages to stderr (CQ+1, cla: yes, tool)

37896 Add opacity control to MouseRegion. Add findAnnotations to Layer. (a: desktop, cla: yes, framework, severe: API break)