Redesign the copresence audio handlers.

components/copresence/mediums/audio/audio_player_stub.cc

+// 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.
+
+#include "components/copresence/mediums/audio/audio_player_stub.h"
+
+#include "media/base/audio_bus.h"
+
+namespace copresence {
+
+AudioPlayerStub::AudioPlayerStub() : is_playing_(false) {
+}
+
+AudioPlayerStub::~AudioPlayerStub() {
+}
+
+void AudioPlayerStub::Initialize() {
+}
+
+void AudioPlayerStub::Play(
+    const scoped_refptr<media::AudioBusRefCounted>& /* samples */) {
+  is_playing_ = true;
+}
+
+void AudioPlayerStub::Stop() {
+  is_playing_ = false;
+}
+
+void AudioPlayerStub::Finalize() {
+  delete this;
+}
+
+bool AudioPlayerStub::IsPlaying() {
+  return is_playing_;
+}
+
+}  // namespace copresence