Implement disabling and enabling media tracks

media/base/fake_text_track_stream.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_BASE_FAKE_TEXT_TRACK_STREAM_H_
 #define MEDIA_BASE_FAKE_TEXT_TRACK_STREAM_H_
 
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "media/base/audio_decoder_config.h"
@@ skipping 11 matching lines @@
   ~FakeTextTrackStream() override;
 
   // DemuxerStream implementation.
   void Read(const ReadCB&) override;
   MOCK_METHOD0(audio_decoder_config, AudioDecoderConfig());
   MOCK_METHOD0(video_decoder_config, VideoDecoderConfig());
   Type type() const override;
   MOCK_METHOD0(EnableBitstreamConverter, void());
   bool SupportsConfigChanges() override;
   VideoRotation video_rotation() override;
+  bool enabled() const override { return true; }
+  void set_enabled(bool enabled, base::TimeDelta timestamp) override {}
 
   void SatisfyPendingRead(const base::TimeDelta& start,
                           const base::TimeDelta& duration,
                           const std::string& id,
                           const std::string& content,
                           const std::string& settings);
   void AbortPendingRead();
   void SendEosNotification();
 
   void Stop();
 
   MOCK_METHOD0(OnRead, void());
 
  private:
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   ReadCB read_cb_;
   bool stopping_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeTextTrackStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_FAKE_TEXT_TRACK_STREAM_H_