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/api/video_track_source_proxy.h b/api/video_track_source_proxy.h
index 820cdcb..eb11bef 100644
--- a/api/video_track_source_proxy.h
+++ b/api/video_track_source_proxy.h
@@ -32,6 +32,8 @@
                      rtc::VideoSinkInterface<VideoFrame>*,
                      const rtc::VideoSinkWants&)
 PROXY_WORKER_METHOD1(void, RemoveSink, rtc::VideoSinkInterface<VideoFrame>*)
+PROXY_WORKER_METHOD1(void, SetLatency, double)
+PROXY_WORKER_CONSTMETHOD0(double, GetLatency)
 PROXY_METHOD1(void, RegisterObserver, ObserverInterface*)
 PROXY_METHOD1(void, UnregisterObserver, ObserverInterface*)
 END_PROXY_MAP()