Bug 1208371 - Add GetPeerIdentity() to MediaStreamTrackSource. r=mt

MozReview-Commit-ID: CsiUYQVb8LO

--HG--
extra : rebase_source : 1d9561a1db1c36b61d319321605e36df01ea1771

dom/media/MediaStreamTrack.h

@@ -23,6 +23,7 @@ class MediaStream;
 class MediaStreamGraph;
 class MediaStreamTrackListener;
 class PeerConnectionImpl;
+class PeerIdentity;
 class ProcessedMediaStream;
 class RemoteSourceStreamInfo;
 
@@ -75,6 +76,17 @@ public:
    */
   virtual CORSMode GetCORSMode() const { return CORS_NONE; }
 
+  /**
+   * This is used in WebRTC. A peerIdentity constrained MediaStreamTrack cannot
+   * be sent across the network to anything other than a peer with the provided
+   * identity. If this is set, then GetPrincipal() should return an instance of
+   * nsNullPrincipal.
+   *
+   * A track's PeerIdentity is immutable and will not change during the track's
+   * lifetime.
+   */
+  virtual const PeerIdentity* GetPeerIdentity() const { return nullptr; }
+
   /**
    * Indicates whether the track is remote or not per the MediaCapture and
    * Streams spec.
@@ -240,6 +252,11 @@ public:
    */
   CORSMode GetCORSMode() const { return GetSource().GetCORSMode(); }
 
+  /**
+   * Get this track's PeerIdentity.
+   */
+  const PeerIdentity* GetPeerIdentity() const { return GetSource().GetPeerIdentity(); }
+
   MediaStreamGraph* Graph();
 
   MediaStreamTrackSource& GetSource() const