Chromecast: adds interfaces for hardware layer of CMA pipeline.

chromecast/media/cma/backend/video_pipeline_device.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 "chromecast/media/base/decrypt_context.h"
+#include "chromecast/media/cma/backend/video_pipeline_device.h"
 
 namespace chromecast {
 namespace media {
 
-DecryptContext::DecryptContext(CastKeySystem key_system)
-    : key_system_(key_system) {
+VideoPipelineDevice::VideoClient::VideoClient() {
 }
 
-DecryptContext::~DecryptContext() {
+VideoPipelineDevice::VideoClient::~VideoClient() {
 }
 
-crypto::SymmetricKey* DecryptContext::GetKey() const {
-  return NULL;
+VideoPipelineDevice::VideoPipelineDevice() {
+}
+
+VideoPipelineDevice::~VideoPipelineDevice() {
 }
 
 }  // namespace media
 }  // namespace chromecast