danilchap 653063f6fd Add functions to get/set rtp header extension by id.
This helps with dynamic size extensions.

BUG=webrtc:7433

Review-Url: https://codereview.webrtc.org/2789773004
Cr-Commit-Position: refs/heads/master@{#17505}
2017-04-03 13:16:30 +00:00
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