Create //webrtc/api:libjingle_peerconnection_api + refactorings.

webrtc/api/mediastreamtrack.h

-/*
- *  Copyright 2011 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef WEBRTC_API_MEDIASTREAMTRACK_H_
-#define WEBRTC_API_MEDIASTREAMTRACK_H_
-
-#include <string>
-
-#include "webrtc/api/mediastreaminterface.h"
-#include "webrtc/api/notifier.h"
-
-namespace webrtc {
-
-// MediaTrack implements the interface common to AudioTrackInterface and
-// VideoTrackInterface.
-template <typename T>
-class MediaStreamTrack : public Notifier<T> {
- public:
-  typedef typename T::TrackState TypedTrackState;
-
-  std::string id() const override { return id_; }
-  MediaStreamTrackInterface::TrackState state() const override {
-    return state_;
-  }
-  bool enabled() const override { return enabled_; }
-  bool set_enabled(bool enable) override {
-    bool fire_on_change = (enable != enabled_);
-    enabled_ = enable;
-    if (fire_on_change) {
-      Notifier<T>::FireOnChanged();
-    }
-    return fire_on_change;
-  }
-
- protected:
-  explicit MediaStreamTrack(const std::string& id)
-      : enabled_(true), id_(id), state_(MediaStreamTrackInterface::kLive) {}
-
-  bool set_state(MediaStreamTrackInterface::TrackState new_state) {
-    bool fire_on_change = (state_ != new_state);
-    state_ = new_state;
-    if (fire_on_change)
-      Notifier<T>::FireOnChanged();
-    return true;
-  }
-
- private:
-  bool enabled_;
-  std::string id_;
-  MediaStreamTrackInterface::TrackState state_;
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_API_MEDIASTREAMTRACK_H_