fix(benchpress): Allow ignoring navigationStart events in perflog met…

[heathkit]

…ric.

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[X] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] angular.io application / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

The Benchpress perflog metric will only aggregate perf events after the most recent navigationStart event. The assumption is that navigationStart only happens on a page load, but our tests include a component that adds an iframe. Adding the iframe to the DOM also logs a navigationStart event. This behavior prevents us from testing our components with benchpress.

Issue Number: N/A

What is the new behavior?

The default behavior is the same, but now users can optionally ignore navigationStart events if they wish.

Does this PR introduce a breaking change?

[ ] Yes
[X] No

Other information

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