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Nate Biggs ac6150c4c0 [dart2js] Improve deferred part file logging.
Adds an "eventLog" property to the global "$__dart_deferred_initializers__" object. The event log is just a JS Array that gets initialized alongside $__dart_deferred_initializers__.

Each event entry is a String->String JS object. I unified the format of these event objects for easier parsing.

Each printed event is now valid JSON (passed through JSON.stringify) so we can more easily post-process the logs if necessary.

Fully replacing the existing "_eventLog" field makes the logging logic simpler. Having a single array allows us to not include a timestamp because the array captures the event ordering (actual timing doesn't matter). It also makes it easier to stringify the logs when there's only 1 data source/format.

Sample output:
```

{"hunkName":"out.js_1.part.js","event":"loadHunk"}
{"uri":"path_to/out.js_1.part.js","hunkName":"out.js_1.part.js","event":"downloadHunk"}
{"file":"out.js_1","event":"beginLoadPart"}
{"file":"out.js_1","event":"endPartLoad","hash":"aCscY7yv4EHodRPmCqYn5BqMelA="}
{"uri":"path_to/out.js_1.part.js","hunkName":"out.js_1.part.js","event":"downloadHunkSuccess"}
{"hunkName":"out.js_1.part.js","hash":"aCscY7yv4EHodRPmCqYn5BqMelA=","event":"initialize"}

```

Change-Id: Ifee73be0bf7dc53a0e7710ff033dd2b0fae9fb0e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/307240
Commit-Queue: Nate Biggs <natebiggs@google.com>
Reviewed-by: Stephen Adams <sra@google.com>
2023-06-09 17:05:11 +00:00
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pkg [dart2js] Improve deferred part file logging. 2023-06-09 17:05:11 +00:00
runtime [VM/Timeline] Reset flow_ids_ in TimelineEvent::Reset 2023-06-09 16:18:47 +00:00
samples
sdk [dart2js] Improve deferred part file logging. 2023-06-09 17:05:11 +00:00
tests [gardening] Fix standalone/io/regress_50904_test 2023-06-09 17:04:29 +00:00
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DEPS [co19] Roll co19 to 672e21d5bbd6b4b555f8cf4e7f8119881392e579 2023-06-09 11:13:21 +00:00
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