Propagate base minimum delay from video jitter buffer to webrtc/api.

On api level two methods were added to api/media_stream_interface.cc on VideoSourceInterface,
GetLatency and SetLatency. Latency is measured in seconds, delay in milliseconds but both describes
the same concept.


Bug: webrtc:10287
Change-Id: Ib8dc62a4d73f63fab7e10b82c716096ee6199957
Reviewed-on: https://webrtc-review.googlesource.com/c/123482
Commit-Queue: Ruslan Burakov <kuddai@google.com>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26877}
diff --git a/media/base/fake_media_engine.h b/media/base/fake_media_engine.h
index f586580..3f1c28b 100644
--- a/media/base/fake_media_engine.h
+++ b/media/base/fake_media_engine.h
@@ -441,6 +441,10 @@
 
   std::vector<webrtc::RtpSource> GetSources(uint32_t ssrc) const override;
 
+  bool SetBaseMinimumPlayoutDelayMs(uint32_t ssrc, int delay_ms) override;
+  absl::optional<int> GetBaseMinimumPlayoutDelayMs(
+      uint32_t ssrc) const override;
+
  private:
   bool SetRecvCodecs(const std::vector<VideoCodec>& codecs);
   bool SetSendCodecs(const std::vector<VideoCodec>& codecs);
@@ -452,6 +456,7 @@
   std::vector<VideoCodec> send_codecs_;
   std::map<uint32_t, rtc::VideoSinkInterface<webrtc::VideoFrame>*> sinks_;
   std::map<uint32_t, rtc::VideoSourceInterface<webrtc::VideoFrame>*> sources_;
+  std::map<uint32_t, int> output_delays_;
   VideoOptions options_;
   int max_bps_;
 };