Media Remoting: Add remoting control logic for encrypted contents.

media/remoting/remoting_cdm_context.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 "media/remoting/remoting_cdm_context.h"
+
+#include "media/remoting/remoting_cdm.h"
+#include "media/remoting/remoting_source_impl.h"
+
+namespace media {
+
+namespace {
+// Used as an identifier for RemotingCdmContext::From().
+void* const kClassIdentifier = const_cast<void**>(&kClassIdentifier);
+}  // namespace
+
+// TODO(xjz): Merge this with erickung's implementation.
+RemotingCdmContext::RemotingCdmContext(RemotingCdm* remoting_cdm)
+    : remoting_cdm_(remoting_cdm) {}
+
+RemotingCdmContext::~RemotingCdmContext() {}
+
+RemotingCdmContext* RemotingCdmContext::From(CdmContext* cdm_context) {
+  if (cdm_context && cdm_context->GetClassIdentifier() == kClassIdentifier)
+    return static_cast<RemotingCdmContext*>(cdm_context);
+  return nullptr;
+}
+
+Decryptor* RemotingCdmContext::GetDecryptor() {
+  // TODO(xjz): Merge with erickung's implementation.
+  return nullptr;
+}
+
+int RemotingCdmContext::GetCdmId() const {
+  // TODO(xjz): Merge with erickung's implementation.
+  return CdmContext::kInvalidCdmId;
+}
+
+void* RemotingCdmContext::GetClassIdentifier() const {
+  return kClassIdentifier;
+}
+
+RemotingSourceImpl* RemotingCdmContext::GetRemotingSource() {
+  return remoting_cdm_->GetRemotingSource();
+}
+
+}  // namespace media