waitForAngular does not wait for $httpBackend pass through requests

[mike-bresnahan]

This change #13124 related to this issue #1434 caused this protractor issue angular/protractor#3948.

Node v6.9.2
Protractor 4.0.14
Angular 1.5.8
Chrome 55.0.2883.87
Windows 7

[petebacondarwin]

I think we need to come up with a better way to get hold of the "original" httpBackend service for this.

[petebacondarwin]

I think the easiest option is to change the ngMock implementation to be a decorator that caches the original $httpBackend service somewhere that ngMockE2E can use.

[mike-bresnahan]

Couldn't ngMock's decorator then also support a passThrough() API similar to ngMockE2E's? Then there might be no need to load ngMockE2E into a unit/integration test.

BTW, I personally have no need to use passThrough() in unit/integration tests and the whole idea smells bad to me, but there seems to be some momentum for it.

[petebacondarwin]

One could add the passThrough to ngMock but as you say it is not a good idea for unit tests, so I would rather not add it to the public API. Instead, we accepted that people are using the ngMockE2E in this way and letting them fudge it.

[petebacondarwin]

@mike-bresnahan - you can see I have put together a PR for this. Can you take a look?