Re: [mediacapture-record] More information about timing of recording (start event, blob event, stop event) (#208)

Right now I start the mediarecorders (1 for screen, 1 for cam), wait for both to be started, show a 3s countdown, then mark that actual start point as a "cut" to remove from the start. I check the onStarted on the mediarecorders and use that to remove ~3s from each of the videos.
So quick example:
Start recording, check onStarted, took 500ms to start the mediarecorder, so we want to remove 3s (countdown) - 500ms from the start of that video. I do the same for cam.

It's not ideal and there is definitely a chance for things to get out of sync but it's the most accurate I've been able to make it.

Been also working with a mac app recently and the CMSampleBuffers there have presentationTimestamps which are great because they do contain timing info. Would be great if browsers also get that.

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