Allow collapsing "recursion" of a method across different classes (different overrides when recursing on a virtual method)

Profile: https://share.firefox.dev/4aV5m8p

In the profile above, I would like to get a percentage breakdown of the time spent in each `XYZFrame::Reflow()` implementation.
Ideally, I would like to "collapse recursion" on the `Reflow` method, even though this method is implemented on a bunch of different classes.

This pattern of having a virtual function that you call through a tree is probably not uncommon.

┆Issue is synchronized with this [Jira Task](https://mozilla-hub.atlassian.net/browse/FP-2)