gistfile1.txt

app.factory('chromeAPI',function($rootScope){

  //native API!
  chrome.runtime.onMessage.addListener(function(message,sender,response){
  
    $rootScope.broadcast('chrome:message',message,sender,response)
  
  })

  function authenticateViaGoogle(){
    //native API!
    chrome.identity.getAuthToken({interactive : true}, function(token){
    
      $rootScope.$broadcast('chrome:authenticated',token)
    
    })
  }

  return {
    signIn : authenticateViaGoogle
  }

}

gistfile2.txt

app.controller('testCtrl',function(chromeAPI){


  $scope.login = chromeAPI.login;
  
  
  
  $scope.$on('chrome:authenticated',function(token){
    console.log('got a token')
    $state.go('home')
  })
  
  $scope.$on('chrome:message',function(message,sender,respond){
  
    console.log('got a message from chrome')
  
  })


})