Provide some other visualisation options for some markers

[julienw]

ideas:

• have a "per second" graph for some markers (toggled by the schema)
• for these markers, clicking on the graph would display percentile histograms

prior art from padenot :

• https://blog.paul.cx/post/profiling-firefox-real-time-media-workloads/#the-new-solution
• https://github.com/padenot/fx-profiler-audio-cb

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