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diff --git a/dom/media/MediaTrackList.h b/dom/media/MediaTrackList.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 et tw=78: */
+/* 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/. */
+
+#ifndef mozilla_dom_MediaTrackList_h
+#define mozilla_dom_MediaTrackList_h
+
+#include "mozilla/DOMEventTargetHelper.h"
+
+namespace mozilla {
+class DOMMediaStream;
+
+namespace dom {
+
+class AudioStreamTrack;
+class AudioTrack;
+class AudioTrackList;
+class HTMLMediaElement;
+class MediaTrack;
+class VideoStreamTrack;
+class VideoTrack;
+class VideoTrackList;
+
+/**
+ * Base class of AudioTrackList and VideoTrackList. The AudioTrackList and
+ * VideoTrackList objects represent a dynamic list of zero or more audio and
+ * video tracks respectively.
+ *
+ * When a media element is to forget its media-resource-specific tracks, its
+ * audio track list and video track list will be emptied.
+ */
+class MediaTrackList : public DOMEventTargetHelper {
+ public:
+  MediaTrackList(nsIGlobalObject* aOwnerObject,
+                 HTMLMediaElement* aMediaElement);
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(MediaTrackList, DOMEventTargetHelper)
+
+  using DOMEventTargetHelper::DispatchTrustedEvent;
+
+  // The return value is non-null, assert an error if aIndex is out of bound
+  // for array mTracks.
+  MediaTrack* operator[](uint32_t aIndex);
+
+  // The track must be from the same Window as this MediaTrackList.
+  void AddTrack(MediaTrack* aTrack);
+
+  // In remove track case, the VideoTrackList::mSelectedIndex should be updated
+  // due to mTracks changed. No need to take care this in add track case.
+  virtual void RemoveTrack(const RefPtr<MediaTrack>& aTrack);
+
+  void RemoveTracks();
+
+  // For the case of src of HTMLMediaElement is non-MediaStream, leave the
+  // aAudioTrack as default(nullptr).
+  static already_AddRefed<AudioTrack> CreateAudioTrack(
+      nsIGlobalObject* aOwnerGlobal, const nsAString& aId,
+      const nsAString& aKind, const nsAString& aLabel,
+      const nsAString& aLanguage, bool aEnabled,
+      AudioStreamTrack* aAudioTrack = nullptr);
+
+  // For the case of src of HTMLMediaElement is non-MediaStream, leave the
+  // aVideoTrack as default(nullptr).
+  static already_AddRefed<VideoTrack> CreateVideoTrack(
+      nsIGlobalObject* aOwnerGlobal, const nsAString& aId,
+      const nsAString& aKind, const nsAString& aLabel,
+      const nsAString& aLanguage, VideoStreamTrack* aVideoTrack = nullptr);
+
+  virtual void EmptyTracks();
+
+  void CreateAndDispatchChangeEvent();
+
+  // WebIDL
+  MediaTrack* IndexedGetter(uint32_t aIndex, bool& aFound);
+
+  MediaTrack* GetTrackById(const nsAString& aId);
+
+  bool IsEmpty() const { return mTracks.IsEmpty(); }
+
+  uint32_t Length() const { return mTracks.Length(); }
+
+  IMPL_EVENT_HANDLER(change)
+  IMPL_EVENT_HANDLER(addtrack)
+  IMPL_EVENT_HANDLER(removetrack)
+
+  friend class AudioTrack;
+  friend class VideoTrack;
+
+ protected:
+  virtual ~MediaTrackList();
+
+  void CreateAndDispatchTrackEventRunner(MediaTrack* aTrack,
+                                         const nsAString& aEventName);
+
+  virtual AudioTrackList* AsAudioTrackList() { return nullptr; }
+
+  virtual VideoTrackList* AsVideoTrackList() { return nullptr; }
+
+  HTMLMediaElement* GetMediaElement() { return mMediaElement; }
+
+  nsTArray<RefPtr<MediaTrack>> mTracks;
+  RefPtr<HTMLMediaElement> mMediaElement;
+};
+
+}  // namespace dom
+}  // namespace mozilla
+
+#endif  // mozilla_dom_MediaTrackList_h