[Flight] Allow overriding request.timeOrigin

[lubieowoce]

Manually stacked on #35506

Currently, IO that finished before the request started is not considered IO:

react/packages/react-server/src/ReactFlightServer.js

Lines 5338 to 5343 in 6a0ab4d

	const ioInfo = info.awaited;
	if (ioInfo.end <= request.timeOrigin) {
	// This was already resolved when we started this render. It must have been some
	// externally cached data. We exclude that information but we keep components and
	// awaits that happened inside this render but might have been deduped within the
	// render.

This leads to loss of debug info when a flight stream is deserialized and serialized again.
We can solve this by allowing "when the the request started" to be set to a point in the past, when the original stream started by doing

ReactServer.renderToReadableStream(..., { startTime: someTimestampInThePast })

I'm not entirely sure about this approach, because it doesn't compose very well. It works in the case where you know you're re-encoding an existing stream and can pass in its startTime. It might get weirder if you're also rendering new content alongside it.

[react-sizebot]

Comparing: 6a0ab4d...7367c43

Critical size changes

Includes critical production bundles, as well as any change greater than 2%:

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable/react-dom/cjs/react-dom.production.js	=	6.84 kB	6.84 kB	+0.11%	1.88 kB	1.88 kB
oss-stable/react-dom/cjs/react-dom-client.production.js	=	608.67 kB	608.67 kB	=	107.63 kB	107.64 kB
oss-experimental/react-dom/cjs/react-dom.production.js	=	6.84 kB	6.84 kB	+0.11%	1.88 kB	1.88 kB
oss-experimental/react-dom/cjs/react-dom-client.production.js	=	674.60 kB	674.60 kB	=	118.57 kB	118.58 kB
facebook-www/ReactDOM-prod.classic.js	=	694.04 kB	694.04 kB	=	122.00 kB	122.01 kB
facebook-www/ReactDOM-prod.modern.js	=	684.43 kB	684.43 kB	=	120.40 kB	120.40 kB

Significant size changes

Includes any change greater than 0.2%:

Expand to show

Name	+/-	Base	Current	+/- gzip	Base gzip	Current gzip
oss-stable-semver/react-server/cjs/react-server-flight.development.js	+0.73%	143.70 kB	144.74 kB	+0.85%	25.64 kB	25.86 kB
oss-stable/react-server/cjs/react-server-flight.development.js	+0.73%	143.70 kB	144.74 kB	+0.85%	25.64 kB	25.86 kB
oss-experimental/react-server/cjs/react-server-flight.development.js	+0.72%	145.79 kB	146.83 kB	+0.92%	26.10 kB	26.34 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-server.browser.development.js	+0.58%	196.96 kB	198.10 kB	+0.64%	35.59 kB	35.82 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-server.browser.development.js	+0.58%	196.96 kB	198.10 kB	+0.64%	35.59 kB	35.82 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-server.browser.development.js	+0.57%	199.07 kB	200.21 kB	+0.57%	36.03 kB	36.24 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-server.edge.development.js	+0.57%	200.66 kB	201.80 kB	+0.60%	36.09 kB	36.31 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-server.edge.development.js	+0.57%	200.66 kB	201.80 kB	+0.60%	36.09 kB	36.31 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-server.edge.development.js	+0.56%	202.75 kB	203.89 kB	+0.57%	36.52 kB	36.73 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.browser.development.js	+0.56%	204.75 kB	205.89 kB	+0.57%	36.90 kB	37.11 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.browser.development.js	+0.56%	204.75 kB	205.89 kB	+0.57%	36.90 kB	37.11 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-server.browser.development.js	+0.56%	205.22 kB	206.36 kB	+0.58%	37.01 kB	37.22 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-server.browser.development.js	+0.56%	205.22 kB	206.36 kB	+0.58%	37.01 kB	37.22 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.browser.development.js	+0.55%	206.85 kB	207.99 kB	+0.52%	37.34 kB	37.53 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-server.browser.development.js	+0.55%	207.33 kB	208.47 kB	+0.52%	37.45 kB	37.64 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-server.edge.development.js	+0.55%	208.48 kB	209.62 kB	+0.56%	37.40 kB	37.61 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-server.edge.development.js	+0.55%	208.48 kB	209.62 kB	+0.56%	37.40 kB	37.61 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.edge.development.js	+0.55%	208.48 kB	209.62 kB	+0.56%	37.40 kB	37.61 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.edge.development.js	+0.55%	208.48 kB	209.62 kB	+0.56%	37.40 kB	37.61 kB
oss-stable-semver/react-server-dom-parcel/cjs/react-server-dom-parcel-server.node.development.js	+0.55%	230.04 kB	231.30 kB	+0.50%	41.07 kB	41.28 kB
oss-stable/react-server-dom-parcel/cjs/react-server-dom-parcel-server.node.development.js	+0.55%	230.04 kB	231.30 kB	+0.50%	41.07 kB	41.28 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-server.edge.development.js	+0.54%	210.57 kB	211.71 kB	+0.55%	37.82 kB	38.03 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.edge.development.js	+0.54%	210.57 kB	211.71 kB	+0.53%	37.83 kB	38.03 kB
oss-experimental/react-server-dom-parcel/cjs/react-server-dom-parcel-server.node.development.js	+0.54%	232.13 kB	233.39 kB	+0.47%	41.53 kB	41.72 kB
oss-stable-semver/react-server-dom-unbundled/cjs/react-server-dom-unbundled-server.node.development.js	+0.53%	236.70 kB	237.96 kB	+0.52%	42.13 kB	42.34 kB
oss-stable/react-server-dom-unbundled/cjs/react-server-dom-unbundled-server.node.development.js	+0.53%	236.70 kB	237.96 kB	+0.52%	42.13 kB	42.34 kB
oss-stable-semver/react-server-dom-webpack/cjs/react-server-dom-webpack-server.node.development.js	+0.53%	237.90 kB	239.15 kB	+0.50%	42.44 kB	42.65 kB
oss-stable/react-server-dom-webpack/cjs/react-server-dom-webpack-server.node.development.js	+0.53%	237.90 kB	239.15 kB	+0.50%	42.44 kB	42.65 kB
oss-stable-semver/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.node.development.js	+0.53%	237.95 kB	239.20 kB	+0.50%	42.43 kB	42.64 kB
oss-stable/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.node.development.js	+0.53%	237.95 kB	239.20 kB	+0.50%	42.43 kB	42.64 kB
oss-experimental/react-server-dom-unbundled/cjs/react-server-dom-unbundled-server.node.development.js	+0.53%	238.79 kB	240.05 kB	+0.47%	42.60 kB	42.80 kB
oss-experimental/react-server-dom-webpack/cjs/react-server-dom-webpack-server.node.development.js	+0.52%	239.99 kB	241.24 kB	+0.45%	42.91 kB	43.10 kB
oss-experimental/react-server-dom-turbopack/cjs/react-server-dom-turbopack-server.node.development.js	+0.52%	240.04 kB	241.29 kB	+0.47%	42.91 kB	43.11 kB
oss-stable-semver/react-server-dom-esm/cjs/react-server-dom-esm-server.node.development.js	+0.52%	223.52 kB	224.68 kB	+0.50%	40.47 kB	40.68 kB
oss-stable/react-server-dom-esm/cjs/react-server-dom-esm-server.node.development.js	+0.52%	223.52 kB	224.68 kB	+0.50%	40.47 kB	40.68 kB
oss-experimental/react-server-dom-esm/cjs/react-server-dom-esm-server.node.development.js	+0.51%	225.61 kB	226.77 kB	+0.48%	40.92 kB	41.12 kB

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