First we’ll configure Rails, assuming you already have a copy of google-maps-utility-library-v3 in your repo. If you don’t have it yet, there are instructions in the bottom.
Most likely, you already have added utility folder to the assets pipeline:
# config/initializer/assets.rb
Rails.application.config.assets.paths += %W(
#{Rails.root}/vendor/assets/google-maps-utility-library-v3