Keep reference to CDM to avoid it's premature destruction

media/blink/webcontentdecryptionmodule_impl.cc

 // Copyright 2013 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/blink/webcontentdecryptionmodule_impl.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 87 matching lines @@
       std::vector<uint8_t>(server_certificate,
                            server_certificate + server_certificate_length),
       std::unique_ptr<SimpleCdmPromise>(
           new CdmResultPromise<>(result, std::string())));
 }
 
 CdmContext* WebContentDecryptionModuleImpl::GetCdmContext() {
   return adapter_->GetCdmContext();
 }
 
+CdmSessionAdapter* WebContentDecryptionModuleImpl::GetCdmAdapterReference() {
+  return adapter_.get();
+}
+
 }  // namespace media