Alexander Aprelev ac1546c794 Add hotReloadInitialDevFSSyncMilliseconds to track how long user have… (#12417)
* Add hotReloadInitialDevFSSyncMilliseconds to track how long user have to wait before being able to do first reload.

This stat is significantly different between existing and preview-dart-2 setting (for the latter, this stat is ~3x slower: 13s vs ~4s).

* Remove ws

* Cleanup timer-related code
2017-10-06 08:39:46 -07:00
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