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Measures usage of the following APIs:
- RTCPeerConnection.getTransceivers()
- RTCPeerConneciton.addTransceiver()
- RTCRtpTransceiver.direction (getter/setter)

// The run was green except for unrelated failures with
// mac_chromium_rel_ng that have happened on multiple CLs
NOTRY=True

Bug: 866433
Change-Id: I430680fa3109681c38e82a7b8d2203e7ec18544e
Reviewed-on: https://chromium-review.googlesource.com/1146659
Commit-Queue: Henrik Boström <hbos@chromium.org>
Reviewed-by: Harald Alvestrand <hta@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577179}