WPT compat: support cache warm run

[patrickhulce]

WPT performs a cache cold run and a cache warm run while LH always clears all storage for the origin and disables the network cache.

[brendankenny]

this implies a new pass with no perf-interfering gatherers?

[patrickhulce]

this implies a new pass with no perf-interfering gatherers?

I'd start with the ability to run from CLI with the storage clearing/cache disabling off.

[brendankenny]

oh I see, not both cold and warm in one run 👍

[paulirish]

I'd start with the ability to run from CLI with the storage clearing/cache disabling off.

Question.. should we have all these options available through the CLI or make a wpt-adapter.js in core that's a bit more custom

[patrickhulce]

I'm in favor of making most of these flags without coupling explicitly to WPT. I don't think it does anything too crazy aside from the video capture, and in some cases just brings nice functionality to all of Lighthouse.

[paulirish]

k. i'm comfortable with both directions. just figured i'd ask. :)