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* [Scheduler] Mark user-timing events Marks when Scheduler starts and stops running a task. Also marks when a task is initially scheduled, and when Scheduler is waiting for a callback, which can't be inferred from a sample-based JavaScript CPU profile alone. The plan is to use the user-timing events to build a Scheduler profiler that shows how the lifetime of tasks interact with each other and with unscheduled main thread work. The test suite works by printing an text representation of a Scheduler flamegraph. * Expose shared array buffer with profiling info Array contains - the priority Scheduler is currently running - the size of the queue - the id of the currently running task * Replace user-timing calls with event log Events are written to an array buffer using a custom instruction format. For now, this is only meant to be used during page start up, before the profiler worker has a chance to start up. Once the worker is ready, call `stopLoggingProfilerEvents` to return the log up to that point, then send the array buffer to the worker. Then switch to the sampling based approach. * Record the current run ID Each synchronous block of Scheduler work is given a unique run ID. This is different than a task ID because a single task will have more than one run if it yields with a continuation.