Requests authorization to access the Google data associated with a signed-in account on the device.

If an eligible signed-in account is found for the application, this request will verify that all the requested OAuth 2.0 scopes were previously granted by the user. If they were, the requested tokens will be returned in the result. If, however, no saved account is found or the required grants do not exist, the result will contain a PendingIntent that can be used to launch the authorization flow. During that flow, the user will be asked to select an account and/or grant the permission for all or a subset of requested scopes. An exception will be set on the returned Task if authorization is not available on the device (for example, internal error or Play Services not available).

Retrieves the AuthorizationResult from the Intent returned upon successful authorization, throwing an ApiException if no result is present or authorization has failed.