Add CdmService to keep track of CDMs

content/public/common/content_client.h

Index: content/public/common/content_client.h
diff --git a/content/public/common/content_client.h b/content/public/common/content_client.h
index 243afccf4b0b361d539dab0fbddc8c9c8a268c62..7f4be8746c197fc8de550fb7e5d6b0adadfd7de4 100644
--- a/content/public/common/content_client.h
+++ b/content/public/common/content_client.h
@@ -45,6 +45,7 @@ class ContentClient;
 class ContentGpuClient;
 class ContentRendererClient;
 class ContentUtilityClient;
+struct CdmInfo;
 struct PepperPluginInfo;
 
 // Setter and getter for the client.  The client should be set early, before any
@@ -86,6 +87,11 @@ class CONTENT_EXPORT ContentClient {
   virtual void AddPepperPlugins(
       std::vector<content::PepperPluginInfo>* plugins) {}
 
+  // Gives the embedder a chance to register the content decryption
+  // modules it supports.
+  virtual void AddContentDecryptionModules(
+      std::vector<content::CdmInfo>* cdms) {}
+
   // Gives the embedder a chance to register its own standard, referrer and
   // saveable url schemes early on in the startup sequence.
   virtual void AddAdditionalSchemes(