Adding AddTrack/RemoveTrack to native PeerConnection API.

talk/app/webrtc/rtpsender.cc

Index: talk/app/webrtc/rtpsender.cc
diff --git a/talk/app/webrtc/rtpsender.cc b/talk/app/webrtc/rtpsender.cc
index c0d23a0503cc08fb5a7fd8b301f8bd99bf076bd8..f9ed4c30cc31d325d5acb7cc3bb220433a6df47b 100644
--- a/talk/app/webrtc/rtpsender.cc
+++ b/talk/app/webrtc/rtpsender.cc
@@ -75,6 +75,21 @@ AudioRtpSender::AudioRtpSender(AudioTrackInterface* track,
   track_->AddSink(sink_adapter_.get());
 }
 
+AudioRtpSender::AudioRtpSender(AudioTrackInterface* track,
+                               AudioProviderInterface* provider,
+                               StatsCollector* stats)
+    : id_(track->id()),
+      stream_id_(rtc::CreateRandomUuid()),
+      provider_(provider),
+      stats_(stats),
+      track_(track),
+      cached_track_enabled_(track->enabled()),
+      sink_adapter_(new LocalAudioSinkAdapter()) {
+  RTC_DCHECK(provider != nullptr);
+  track_->RegisterObserver(this);
+  track_->AddSink(sink_adapter_.get());
+}
+
 AudioRtpSender::AudioRtpSender(AudioProviderInterface* provider,
                                StatsCollector* stats)
     : id_(rtc::CreateRandomUuid()),
@@ -211,6 +226,17 @@ VideoRtpSender::VideoRtpSender(VideoTrackInterface* track,
   track_->RegisterObserver(this);
 }
 
+VideoRtpSender::VideoRtpSender(VideoTrackInterface* track,
+                               VideoProviderInterface* provider)
+    : id_(track->id()),
+      stream_id_(rtc::CreateRandomUuid()),
+      provider_(provider),
+      track_(track),
+      cached_track_enabled_(track->enabled()) {
+  RTC_DCHECK(provider != nullptr);
+  track_->RegisterObserver(this);
+}
+
 VideoRtpSender::VideoRtpSender(VideoProviderInterface* provider)
     : id_(rtc::CreateRandomUuid()),
       stream_id_(rtc::CreateRandomUuid()),