26766 Report early error if appropriate host local engine is not found. (cla: yes, tool)

26770 Revert switch drag behavior (cla: yes, f: material design, framework)

26774 [cupertino_icons] add car, bus, train, paw, controller, and flask icons. (cla: yes, f: cupertino, framework)

26778 Better ListTile leading/trailing widget alignment (cla: yes, f: material design, framework)

26790 Rev Android Platform to 28 for bots (cla: yes, t: gradle, team)

26793 Fill editable_text.dart test coverage (a: tests, a: text input, cla: yes, framework)

26795 Update VERSION_LINUX_SDK (cla: yes, team, 🐧 platform-linux)