function (clientId, clientSecret) {
    this._clientId=clientId
    this._clientSecret=clientSecret
    this._auth = new googleAuth.OAuth2(clientId, clientSecret, '');
}
function (clientId, clientSecret) {
    this._clientId=clientId
    this._clientSecret=clientSecret
    this._auth = new googleAuth.OAuth2(clientId, clientSecret, '');
}
function ( clientId , clientSecret ) { this . _clientId = clientId this . _clientSecret = clientSecret this . _auth = new googleAuth . OAuth2 ( clientId , clientSecret , '' ) ; }
@classdesc
This class interact with Google Contacts API.

@param {String} clientId     The client id
@param {String} clientSecret The client secret key
@constructor
@classdesc This class interact with Google Contacts API .