Switching audio clients to using RestartableAudioRendererSink interface as a sink.

media/audio/mock_render_callback.cc

Index: media/audio/mock_render_callback.cc
diff --git a/media/audio/mock_render_callback.cc b/media/audio/mock_render_callback.cc
new file mode 100644
index 0000000000000000000000000000000000000000..13498b165dd7cb129d632f0840bd2eeb611198be
--- /dev/null
+++ b/media/audio/mock_render_callback.cc
@@ -0,0 +1,12 @@
+// 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 "media/audio/mock_render_callback.h"
+
+namespace media {
+
+MockRenderCallback::MockRenderCallback() {}
+MockRenderCallback::~MockRenderCallback() {}
+
+}  // namespace media