Add CdmService to keep track of CDMs

chrome/common/chrome_content_client.h

 // Copyright (c) 2012 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 CHROME_COMMON_CHROME_CONTENT_CLIENT_H_
 #define CHROME_COMMON_CHROME_CONTENT_CLIENT_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 41 matching lines @@
   // plugin type. This function may return a nullptr if given an empty vector.
   // The method is only visible for testing purposes.
   static content::PepperPluginInfo* FindMostRecentPlugin(
       const std::vector<content::PepperPluginInfo*>& plugins);
 #endif
 
   void SetActiveURL(const GURL& url) override;
   void SetGpuInfo(const gpu::GPUInfo& gpu_info) override;
   void AddPepperPlugins(
       std::vector<content::PepperPluginInfo>* plugins) override;
+  void AddContentDecryptionModules(
+      std::vector<content::ContentDecryptionModuleRegistration>* modules)
+      override;
   void AddAdditionalSchemes(std::vector<url::SchemeWithType>* standard_schemes,
                             std::vector<url::SchemeWithType>* referrer_schemes,
                             std::vector<std::string>* saveable_shemes) override;
   bool CanSendWhileSwappedOut(const IPC::Message* message) override;
   std::string GetProduct() const override;
   std::string GetUserAgent() const override;
   base::string16 GetLocalizedString(int message_id) const override;
   base::StringPiece GetDataResource(
       int resource_id,
       ui::ScaleFactor scale_factor) const override;
@@ skipping 10 matching lines @@
 
   void AddSecureSchemesAndOrigins(std::set<std::string>* schemes,
                                   std::set<GURL>* origins) override;
 
   void AddServiceWorkerSchemes(std::set<std::string>* schemes) override;
 
   bool IsSupplementarySiteIsolationModeEnabled() override;
 };
 
 #endif  // CHROME_COMMON_CHROME_CONTENT_CLIENT_H_