Tern & Protractor support - angelozerr/tern.java GitHub Wiki
tern-protractor provides the protractor tern plugin which gives you a support for protractor.
After installing and converting your project as Tern Project, go at Tern project property, click on Tern / Modules item and select the Protractor tern plugin :

After that you can benefit with protractor completion like functions of by:

If you need Run/Debug Protractor inside your Eclipse, please install AngularJS Eclipse which provides Run/Debug Protractor support.