Adding an interface to allow extention of the audio player for CRD and iOS.

remoting/client/fake_audio_consumer.cc

+// Copyright 2016 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 "remoting/client/fake_audio_consumer.h"
+#include "remoting/proto/audio.pb.h"
+
+namespace remoting {
+
+FakeAudioConsumer::FakeAudioConsumer() : weak_factory_(this) {}
+
+FakeAudioConsumer::~FakeAudioConsumer() {}
+
+void FakeAudioConsumer::AddAudioPacket(std::unique_ptr<AudioPacket> packet) {}
+
+base::WeakPtr<FakeAudioConsumer> FakeAudioConsumer::GetWeakPtr() {
+  return weak_factory_.GetWeakPtr();
+}
+
+}  // namespace remoting