feat($rootScope): allow passing locals argument to $evalAsync

[shahata]

No description provided.

[googlebot]

CLAs look good, thanks!

[caitp]

tbh, I asked if we wanted this when implementing $$applyAsync, and I recall we decided against it as there weren't really any use cases that depended on it. I suppose it could simplify some of the async ng-event handlers a little bit, though (no strong opinion on this one way or the other)

[caitp]

@petebacondarwin / @IgorMinar do we want to do this?

[petebacondarwin]

@shahata - do you have a compelling use case for this feature?

[shahata]

No, I just thought it makes sense that ppl will be able to do:

scope.$evalAsync(exp, locals);

instead of the more verbose:

scope.$evalAsync(function () {
  scope.$eval(exp, locals);
});

[petebacondarwin]

LGTM