diff -r 000000000000 -r 6474c204b198 content/media/MediaStreamTrack.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/media/MediaStreamTrack.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,58 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "MediaStreamTrack.h"
+
+#include "DOMMediaStream.h"
+#include "nsIUUIDGenerator.h"
+#include "nsServiceManagerUtils.h"
+
+namespace mozilla {
+namespace dom {
+
+MediaStreamTrack::MediaStreamTrack(DOMMediaStream* aStream, TrackID aTrackID)
+  : mStream(aStream), mTrackID(aTrackID), mEnded(false), mEnabled(true)
+{
+  SetIsDOMBinding();
+
+  memset(&mID, 0, sizeof(mID));
+
+  nsresult rv;
+  nsCOMPtr<nsIUUIDGenerator> uuidgen =
+    do_GetService("@mozilla.org/uuid-generator;1", &rv);
+  if (uuidgen) {
+    uuidgen->GenerateUUIDInPlace(&mID);
+  }
+}
+
+MediaStreamTrack::~MediaStreamTrack()
+{
+}
+
+NS_IMPL_CYCLE_COLLECTION_INHERITED(MediaStreamTrack, DOMEventTargetHelper,
+                                   mStream)
+
+NS_IMPL_ADDREF_INHERITED(MediaStreamTrack, DOMEventTargetHelper)
+NS_IMPL_RELEASE_INHERITED(MediaStreamTrack, DOMEventTargetHelper)
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(MediaStreamTrack)
+NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
+
+void
+MediaStreamTrack::GetId(nsAString& aID)
+{
+  char chars[NSID_LENGTH];
+  mID.ToProvidedString(chars);
+  aID = NS_ConvertASCIItoUTF16(chars);
+}
+
+void
+MediaStreamTrack::SetEnabled(bool aEnabled)
+{
+  mEnabled = aEnabled;
+  mStream->SetTrackEnabled(mTrackID, aEnabled);
+}
+
+}
+}