media: Verify CDM Host files

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 57a52faa3aed95f83c39b41fbda479579499799a..ea0bb0d80aaadcd331655a1995b0c6e42c8a7f93 100644
--- a/content/public/common/content_client.h
+++ b/content/public/common/content_client.h
@@ -45,6 +45,7 @@ class ContentGpuClient;
 class ContentRendererClient;
 class ContentUtilityClient;
 class OriginTrialPolicy;
+struct CdmHostFilePath;
 struct CdmInfo;
 struct PepperPluginInfo;
 
@@ -87,10 +88,13 @@ 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.
+  // Gives the embedder a chance to register the Content Decryption Modules
+  // (CDM) it supports, as well as the CDM host file paths to verify CDM host.
+  // |cdms| or |cdm_host_file_paths| can be null which means that specific list
+  // is not needed.
   virtual void AddContentDecryptionModules(
-      std::vector<content::CdmInfo>* cdms) {}
+      std::vector<content::CdmInfo>* cdms,
+      std::vector<content::CdmHostFilePath>* cdm_host_file_paths) {}
 
   // Gives the embedder a chance to register its own schemes early in the
   // startup sequence.