Hookup the MediaStream glue for Adding and Removing tracks to an existing MediaStream.

content/renderer/media/media_stream_center.cc

Index: content/renderer/media/media_stream_center.cc
diff --git a/content/renderer/media/media_stream_center.cc b/content/renderer/media/media_stream_center.cc
index 29f2363c75efb9eb6be296e98bccb4ebc5f6cb95..14b0327c51ef18d54bbc1adbb5f99290b57451e7 100644
--- a/content/renderer/media/media_stream_center.cc
+++ b/content/renderer/media/media_stream_center.cc
@@ -32,7 +32,6 @@ static webrtc::MediaStreamInterface* GetNativeMediaStream(
   return extra_data->stream();
 }
 
-
 static webrtc::MediaStreamTrackInterface* GetNativeMediaStreamTrack(
       const WebKit::WebMediaStream& stream,
       const WebKit::WebMediaStreamTrack& component) {
@@ -99,4 +98,22 @@ void MediaStreamCenter::didCreateMediaStream(
   rtc_factory_->CreateNativeLocalMediaStream(&stream);
 }
 
+bool MediaStreamCenter::didAddMediaStreamTrack(
+    const WebKit::WebMediaStream& stream,
+    const WebKit::WebMediaStreamTrack& track) {
+  if (!rtc_factory_)
+    return false;
+
+  return rtc_factory_->AddNativeMediaStreamTrack(stream, track);
+}
+
+bool MediaStreamCenter::didRemoveMediaStreamTrack(
+    const WebKit::WebMediaStream& stream,
+    const WebKit::WebMediaStreamTrack& track) {
+  if (!rtc_factory_)
+    return false;
+
+  return rtc_factory_->RemoveNativeMediaStreamTrack(stream, track);
+}
+
 }  // namespace content