Unfortunately it's not possible to use the source you cite (Google Maps) for adding data to OSM.

Google has made clear that their data is proprietary, and forbids use by others. So, it's fundamentally incompatible with OSM('s license (& goals / principles)).

See: http://wiki.openstreetmap.org/wiki/FAQ#Why_don.27t_you_just_use_Google_Maps.2Fwhoever_for_your_data.3F

However, someone collecting data via survey should safely avoid the problem.