Add flag to surface memory-infra in waterfall/timeline

[jspurlin]

Feature Request Summary

Today no memory information is surfaced in WPT results. It'd be great if there way a flag to collect this info and surface it in the waterfall and timeline. Here's how the data is represented in chromium-based browsers when the memory checkbox is checked (and is in line with what I would want as an output of this feature request). In the waterfall, it'd be great if this data existed in a row at the bottom of the waterfall, just below the CPU Utilization row, for exmaple.

What's the motivation or use case for the change/feature?

Getting memory info is an important aspect of page performance. The data can already be recorded in the devtools profilers so it makes sense to allow users to be able to surface this data in their results.

[tkadlec]

Thanks for the suggestion, @jspurlin! Agree that it would be amazing to get some memory info into WPT. Will chat with the team and see how we can prioritize