tree 548c48631ad9a82265693b9a65541950889c7172
parent 8d3d6cf9089519add886d32e7839ea30074ac310
author Henrik Boström <hbos@webrtc.org> 1558006340 +0200
committer Commit Bot <commit-bot@chromium.org> 1558008727 +0000

ReportBlockData and observer added, for stats collection in future CLs.

The ReportBlockData contains information about a ReportBlock and
additional data such as RTT. This will be used for the calculation of
RTCRemoteInboundRtpStreamStats, see full picture here:
https://webrtc-review.googlesource.com/c/src/+/134107

ReportBlockData is a class version of the previously internal struct
RTCPReceiver::ReportBlockWithRtt.
- The new name makes sense even if we add more info to it, which will
  be needed for future metrics.
- The new location is modules/rtp_rtcp/include/report_block_data.h.

The RTCPReceiver allows obtaining the ReportBlockData in two ways:
1. Using a ReportBlockDataObserver that is notified on receiving a
   report block.
2. Using the GetLatestReportBlockData().

Both codepaths will be needed; video stats uses observers and audio
stats uses polling.

Further plumbing will be done in follow-up CLs.

Bug: webrtc:10455, webrtc:10456
Change-Id: Ic9e5b4f451b5f4b203efcd6fa3bbf9736487e1f4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/136584
Commit-Queue: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27961}