Add CdmService to keep track of CDMs

content/public/browser/cdm_service.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 CONTENT_PUBLIC_BROWSER_CDM_SERVICE_H_
+#define CONTENT_PUBLIC_BROWSER_CDM_SERVICE_H_
+
+#include <vector>
+
+#include "content/common/content_export.h"
+
+namespace content {
+
+struct CdmInfo;
+
+// Keeps track of the Content Decryption Modules that are available.
+class CONTENT_EXPORT CdmService {
+ public:
+  // Returns the CdmService singleton.
+  static CdmService* GetInstance();
+
+  virtual ~CdmService() {}
+
+  // Must be called on the instance to finish initialization.
+  virtual void Init() = 0;
+
+  // Registers a CDM with the specified CDM information. The CDM will be
+  // inserted at the head of the list so that it can override any older
+  // registrations.
+  // Note: Since only 1 version of the CDM can be loaded at any given time,
+  // it is possible that there will be a mismatch between the functionality
+  // reported and what is actually available, if the reported functionality
+  // changes between versions. (http://crbug.com/599588)
+  virtual void RegisterCdm(const CdmInfo& info) = 0;
+
+  // Returns the list of all registered CDMs and the associated data.
+  virtual const std::vector<CdmInfo>& GetAllRegisteredCdms() = 0;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_CDM_SERVICE_H_