Just for the record, the example doesn't use Icons at all, but it's a good call:
noor:~/Projects/flutter_path_drawing/$ grep -rs Icons example/*
example/pubspec.yaml: # The following adds the Cupertino Icons font to your application.
example/pubspec.yaml: # Use with the CupertinoIcons class for iOS style icons.
example/pubspec.yaml: # The following line ensures that the Material Icons font is
example/pubspec.yaml: # the material Icons class.
Just for the record, the example doesn't use
Icons
at all, but it's a good call: