Jia Hao dd6dd7aef1
Fix tracing of startup events (#59982)
When `retainPriorEvents` is passed as true, the current behavior still limits timeline events to the timestamp after `traceEvents` is called. This can cause startup events to be missing.

This fixes it by passing null to `stopTracingAndDownloadTimeline` for the start and end time.

Related: #58430
2020-06-23 08:07:05 +08:00
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