I just blindly assumed that adding the video_player_web dependency in flutter/samples#170 would be enough but some more stuff is needed and it would make sense to fix it in this repo instead of in the web samples:

• The connectivity plugin used in video_demo.dart is not available on the web.

• We can not use dart:io on the web.

• Adding video_player_web will not be needed once [video_player] Migrate to new pubspec plugins schema plugins#2370 is merged.

@ditman I offered to fix this but you mentioned in flutter/plugins#2384 that you were also playing with this. Do you want to take this? I wouldn't mind as I am not sure what the nicest solution to the dart:io problem would be.