Provide routing details in router events

I’m submitting a…

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[X] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead see https://github.com/angular/angular/blob/master/CONTRIBUTING.md#question

Current behavior

Router#events do not contain information on whether skipLocationChange or replaceUrl have been provided.

Expected behavior

Events such as NavigationEnd should contain these flags.

What is the motivation / use case for changing the behavior?

This would be useful, e.g,. to track navigation events to build an internal history stack which can be used to implement a »back button« in the app. However, there may be components within a page that change the URL but are used with replaceUrl to prevent adding to the location history. In the router events, however, it is not possible to see whether these flags have been provided.

I also don’t want to use Location#back because I’d like to provide an actual routerLink instead of a click handler such that the link is actually a proper link.

Environment

Angular version: 5.x

[jasonaden]

Thanks for this issue. I can definitely see how this would be useful. Is this something you would like to create a PR for?

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