3458 [camera] Clockwise rotation of focus point in android (cla: yes, p: camera, platform-android)

3460 Migrate path_provider to null safety. (cla: yes, nnbd, p: path_provider)

3461 [ci][image_picker][webviews_flutter] enable Xcode 12  (cla: yes, p: image_picker, p: webview_flutter, waiting for tree to go green)

3466 Migrate shared_preferences_platform_interfaces to null safety (cla: yes, p: shared_preferences)

3467 [image_picker_platform_interface] fix test asset file location (cla: yes, p: cross_file, p: image_picker)

3468 Revert “[cross_file] Migrate to null-safety. (#3452)” (cla: yes, p: cross_file)