Redesign the copresence audio handlers.

components/copresence/mediums/audio/audio_recorder_stub.h

Index: components/copresence/mediums/audio/audio_recorder_stub.h
diff --git a/components/copresence/mediums/audio/audio_recorder_stub.h b/components/copresence/mediums/audio/audio_recorder_stub.h
new file mode 100644
index 0000000000000000000000000000000000000000..d589d02628f99cb55d413d1e3103bd160128ed57
--- /dev/null
+++ b/components/copresence/mediums/audio/audio_recorder_stub.h
@@ -0,0 +1,36 @@
+// Copyright 2014 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 COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_RECORDER_STUB_H_
+#define COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_RECORDER_STUB_H_
+
+#include "base/macros.h"
+#include "components/copresence/mediums/audio/audio_recorder.h"
+
+namespace copresence {
+
+class AudioRecorderStub final : public AudioRecorder {
+ public:
+  AudioRecorderStub();
+  virtual ~AudioRecorderStub();
+
+  // AudioRecorder overrides:
+  virtual void Initialize(const RecordedSamplesCallback& cb) override;
+  virtual void Record() override;
+  virtual void Stop() override;
+  virtual void Finalize() override;
+  virtual bool IsRecording() override;
+
+  void TriggerDecodeRequest();
+
+ private:
+  RecordedSamplesCallback cb_;
+  bool is_recording_;
+
+  DISALLOW_COPY_AND_ASSIGN(AudioRecorderStub);
+};
+
+}  // namespace copresence
+
+#endif  // COMPONENTS_COPRESENCE_MEDIUMS_AUDIO_AUDIO_RECORDER_STUB_H_