Here is the solution I used:
describe('Inside non-angular iframe', function () {
it('you can access iframe objects.', function () {
...
_form.goToIFrame();
//work with iframe objects
_form.goToDefault();
});
where _form.goToIFrame(); and _form.goToDefault(); means:
goToIFrame: function () {
browser.switchTo().frame(browser.driver.findElement(by.tagName('iframe')));
browser.ignoreSynchronization = true;
},
goToDefault: function () {
browser.driver.switchTo().defaultContent();
browser.ignoreSynchronization = false;
browser.waitForAngular();
}
That's all.
Happy testing and... make it green, becomes a dream :).