3070 [path_provider_android] Move Path operations to background thread (cla: yes, waiting for test harness)

3071 [url_launcher_web] Remove package:platform_detect (cla: yes)

3072 Add deprecation suppression for plugins marked with -Werror (cla: yes)

3073 [in_app_purchase] Update typo in example main.dart (cla: yes)

3075 [url_launcher_web] Improve attribution of package:platform_detect (cla: yes)

3080 [url_launcher_web] Move third_party under src. (cla: yes)

3081 [video_player_web] Playback speed (cla: yes)

3082 [video_player] Fix tests (cla: yes)