Re: [w3ctag/design-reviews] JS Self-Profiling API (#366)

> What's the plan for standardizing the profile format across engines?

For function labels, we want to leverage the engine-set "name" property of captured functions from ECMA-262 wherever possible. Function line/column/resource info will be specified normatively, which will be critical to ensure compatibility with sourcemaps.

On the topic of the inclusion of functions, whether or not we should allow some inlined/optimized functions to be omitted from traces is an open question- folks from Apple preferred this, but it may make it more difficult to aggregate traces across different browsers/JS engines.

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