GitLab

Mostly moving things around, refactoring...

1. Move GetRTCStatsCallback from rtc_peer_connection_handler.cc to
   rtc_stats.[h/cc] where other blink/webrtc stats-related content-glue
   is placed, and rename it RTCStatsCollectorCallbackImpl.

   This allows it to be used by content's RTCRtpSender and
   RTCRtpReceiver in follow-up CLs.

2. Remove unused content::RTCRtpSender-constructor.

3. Move WebRTCStatsReportCallbackResolver from RTCPeerConnection.cpp
   to its own file.

   This allows it to be used by blink's RTCRtpSender and RTCRtpReceiver
   in follow-up CLs.

4. Implement new PeerConnectionInterface::GetStats() functions in
   MockPeerConnectionImpl (need to wait for
   https://webrtc-review.googlesource.com/c/src/+/62900 to land and roll
   into chromium).

Bug: 680172
Change-Id: Ief18b2fb96ebc292149af606bd0edd87bac9e961
Reviewed-on: https://chromium-review.googlesource.com/973368
Commit-Queue: Henrik Boström <hbos@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546101}