Move RTP timestamp members to Metadata objects

[tonyherre]

Fixes #203

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[tonyherre]

@alvestrand @fippo explicitly

[alvestrand]

I think this is good. Want to have another pair of eyes on it before Thursday next week - @youennf ?

[youennf]

LGTM.
I wonder what the transition plan is for shipping implementations.
Maybe the use is low enough that there is no need to keep both for some amount of time?

[tonyherre]

Thanks all!

I wonder what the transition plan is for shipping implementations. Maybe the use is low enough that there is no need to keep both for some amount of time?

My intention for chromium is to have both for some time. We don't have use counters yet though, so I'm not sure how long that would have to be.

[fippo]

Sseveral CPaaS vendors have announced support for client side encryption which means an update cycle of at least six months I'd say.

[alvestrand]

Editors meeting: Needs rebase, can be merged when rebased.

[tonyherre]

Rebased, thanks.

[fippo]

I get validation failures in #140 due to the leftover RTCEncodedVideoFrame/timestamp et al which were removed here but that wasn't picked up by the validator so passed?

[saschanaz]

Just saw this while maintaining https://github.com/microsoft/TypeScript-DOM-lib-generator/, is it safe to remove this without webcompat issue while it's shipped on every engine per MDN?