Add Google APIs to an App Engine Project

To add Google APIs to an App Engine project: 

1. Select a project to add an API to and then select Add Google APIs... from the Google Development Tools dropdown. Or, right click on the project and choose Google > Add Google APIs...

2.  Choose an API to add from the list of available APIs, and then click Finish. Multiple API versions can be available for a given API. The preferred version of the API is marked Preferred.
3. The API will be downloaded and added to your project, and appears in the navigation, as follows