Redesign the copresence audio handlers.

components/copresence/mediums/audio/audio_player_impl.h

Index: components/copresence/mediums/audio/audio_player_impl.h
diff --git a/components/copresence/mediums/audio/audio_player.h b/components/copresence/mediums/audio/audio_player_impl.h
similarity index 66%
copy from components/copresence/mediums/audio/audio_player.h
copy to components/copresence/mediums/audio/audio_player_impl.h
index e2bb64dce169199347dcdc50533b369ff5f49429..84e0753894018829fdff3ab2b97e92ed4901566a 100644
--- a/components/copresence/mediums/audio/audio_player.h
+++ b/components/copresence/mediums/audio/audio_player_impl.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_PLAYER_H_
-#define COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_PLAYER_H_
+#ifndef COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_PLAYER_IMPL_H_
+#define COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_PLAYER_IMPL_H_
 
 #include <vector>
 
@@ -11,6 +11,7 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/lock.h"
+#include "components/copresence/mediums/audio/audio_player.h"
 #include "media/audio/audio_io.h"
 
 namespace media {
@@ -20,25 +21,19 @@ class AudioBusRefCounted;
 
 namespace copresence {
 
-// The AudioPlayer class will play a set of samples till it is told to stop.
-class AudioPlayer : public media::AudioOutputStream::AudioSourceCallback {
+// The AudioPlayerImpl class will play a set of samples till it is told to stop.
+class AudioPlayerImpl final
+    : public AudioPlayer,
+      public media::AudioOutputStream::AudioSourceCallback {
  public:
-  AudioPlayer();
+  AudioPlayerImpl();
 
-  // Initializes the object. Do not use this object before calling this method.
-  virtual void Initialize();
-
-  // Play the given samples. These samples will keep on being played in a loop
-  // till we explicitly tell the player to stop playing.
-  virtual void Play(const scoped_refptr<media::AudioBusRefCounted>& samples);
-
-  // Stop playing.
-  virtual void Stop();
-
-  // Cleans up and deletes this object. Do not use object after this call.
-  virtual void Finalize();
-
-  bool IsPlaying();
+  // AudioPlayer overrides:
+  void Initialize() override;
+  void Play(const scoped_refptr<media::AudioBusRefCounted>& samples) override;
+  void Stop() override;
+  void Finalize() override;
+  bool IsPlaying() override;
 
   // Takes ownership of the stream.
   void set_output_stream_for_testing(
@@ -46,15 +41,13 @@ class AudioPlayer : public media::AudioOutputStream::AudioSourceCallback {
     output_stream_for_testing_.reset(output_stream_for_testing);
   }
 
- protected:
-  ~AudioPlayer() override;
-  void set_is_playing(bool is_playing) { is_playing_ = is_playing; }
-
  private:
   friend class AudioPlayerTest;
   FRIEND_TEST_ALL_PREFIXES(AudioPlayerTest, BasicPlayAndStop);
   FRIEND_TEST_ALL_PREFIXES(AudioPlayerTest, OutOfOrderPlayAndStopMultiple);
 
+  virtual ~AudioPlayerImpl();
+
   // Methods to do our various operations; all of these need to be run on the
   // audio thread.
   void InitializeOnAudioThread();
@@ -88,9 +81,9 @@ class AudioPlayer : public media::AudioOutputStream::AudioSourceCallback {
   // Index to the frame in the samples that we need to play next.
   int frame_index_;
 
-  DISALLOW_COPY_AND_ASSIGN(AudioPlayer);
+  DISALLOW_COPY_AND_ASSIGN(AudioPlayerImpl);
 };
 
 }  // namespace copresence
 
-#endif  // COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_PLAYER_H_
+#endif  // COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_PLAYER_IMPL_H_