2436 [path_provider] now supports getDownloadsDirectory() on macOS. (cla: yes)

2444 Migrate away from deprecated BinaryMessages (cla: yes)

2445 [webview_flutter] Setup XCTests (cla: yes)

2446 Update CODEOWNERS (cla: yes)

2447 [camera] Fix crash from changing permissions (cla: yes)

2448 Update Gradle version (cla: yes)

2452 [sensors] Update readme documentation (cla: yes, waiting for test harness)

2453 [android_alarm_manager] Fixed issue where callback lookup was failing in the background (cla: yes)

2455 [google_sign_in_web] Fix race condition on init. (cla: yes)