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

services/media/framework/stages/lpcm_transform_stage.h

Index: services/media/framework/stages/lpcm_transform_stage.h
diff --git a/services/media/framework/stages/lpcm_transform_stage.h b/services/media/framework/stages/lpcm_transform_stage.h
deleted file mode 100644
index 2c4f61349948c3d9c9d64ac5cc37d1428b39f753..0000000000000000000000000000000000000000
--- a/services/media/framework/stages/lpcm_transform_stage.h
+++ /dev/null
@@ -1,43 +0,0 @@
-// 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_ENGINE_LPCM_TRANSFORM_STAGE_H_
-#define SERVICES_MEDIA_FRAMEWORK_ENGINE_LPCM_TRANSFORM_STAGE_H_
-
-#include "services/media/framework/models/lpcm_transform.h"
-#include "services/media/framework/stages/stage.h"
-
-namespace mojo {
-namespace media {
-
-// A stage that hosts an LpcmTransform.
-class LpcmTransformStage : public Stage {
- public:
-  LpcmTransformStage(LpcmTransformPtr transform);
-
-  ~LpcmTransformStage() override;
-
-  // Stage implementation.
-  uint32_t input_count() const override;
-
-  StageInput& input(uint32_t index) override;
-
-  uint32_t output_count() const override;
-
-  StageOutput& output(uint32_t index) override;
-
-  bool Prepare(UpdateCallback update_callback) override;
-
-  void Update(Engine* engine) override;
-
- private:
-  LpcmStageInput input_;
-  LpcmStageOutput output_;
-  LpcmTransformPtr transform_;
-};
-
-}  // namespace media
-}  // namespace mojo
-
-#endif  // SERVICES_MEDIA_FRAMEWORK_ENGINE_LPCM_TRANSFORM_STAGE_H_