Embed a cricket::MediaConfig in RTCConfiguration.

webrtc/api/peerconnectioninterface.h

Index: webrtc/api/peerconnectioninterface.h
diff --git a/webrtc/api/peerconnectioninterface.h b/webrtc/api/peerconnectioninterface.h
index 22109c4088e9415f0f55015ee95b9747dea24b4d..9dcf8a703d51098cad87206cc76bc5e7b04576f5 100644
--- a/webrtc/api/peerconnectioninterface.h
+++ b/webrtc/api/peerconnectioninterface.h
@@ -70,6 +70,7 @@
 #include "webrtc/base/rtccertificate.h"
 #include "webrtc/base/socketaddress.h"
 #include "webrtc/base/sslstreamadapter.h"
+#include "webrtc/media/base/mediachannel.h"
 #include "webrtc/p2p/base/portallocator.h"
 
 namespace rtc {
@@ -241,16 +242,13 @@ class PeerConnectionInterface : public rtc::RefCountInterface {
     int ice_backup_candidate_pair_ping_interval;  // ms
     ContinualGatheringPolicy continual_gathering_policy;
     std::vector<rtc::scoped_refptr<rtc::RTCCertificate>> certificates;
-    bool disable_prerenderer_smoothing;
     bool prioritize_most_likely_ice_candidate_pairs;
+    struct cricket::MediaConfig media_config;

[perkj_webrtc, 2016/03/22 08:31:25]

Doesn't this change break chrome and other clients? 

Also- I am not so happy about moving parts of the config into a sub struct. Why
these 4 types and not many of the others such as screencast_min_bintrate or
audio_jitter_buffer_max_packets....  I am not so sure this is a step in the
right direction. 

     // Flags corresponding to values set by constraint flags.
     // rtc::Optional flags can be "missing", in which case the webrtc
     // default applies.
     bool disable_ipv6;
-    rtc::Optional<bool> enable_dscp;
     bool enable_rtp_data_channel;
-    rtc::Optional<bool> cpu_overuse_detection;
-    rtc::Optional<bool> suspend_below_min_bitrate;
     rtc::Optional<int> screencast_min_bitrate;
     rtc::Optional<bool> combined_audio_video_bwe;
     rtc::Optional<bool> enable_dtls_srtp;
@@ -264,7 +262,6 @@ class PeerConnectionInterface : public rtc::RefCountInterface {
           ice_connection_receiving_timeout(kUndefined),
           ice_backup_candidate_pair_ping_interval(kUndefined),
           continual_gathering_policy(GATHER_ONCE),
-          disable_prerenderer_smoothing(false),
           prioritize_most_likely_ice_candidate_pairs(false),
           disable_ipv6(false),
           enable_rtp_data_channel(false) {}