Motown: Remove LPCM optimizations, fix prepare, add flush, add ActiveMultistreamSink model/stage

services/media/framework/models/part.h

+// 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.
+
+#ifndef SERVICES_MEDIA_FRAMEWORK_MODELS_PART_H_
+#define SERVICES_MEDIA_FRAMEWORK_MODELS_PART_H_
+
+namespace mojo {
+namespace media {
+
+// Host for a source, sink or transform.
+class Part {
+ public:
+  virtual ~Part() {}
+
+  // Flushes media state.
+  virtual void Flush() {}
+};
+
+}  // namespace media
+}  // namespace mojo
+
+#endif  // SERVICES_MEDIA_FRAMEWORK_MODELS_PART_H_