Add type argument to pepper content decryptor method GenerateKeyRequest().

ppapi/cpp/private/content_decryptor_private.h

Index: ppapi/cpp/private/content_decryptor_private.h
diff --git a/ppapi/cpp/private/content_decryptor_private.h b/ppapi/cpp/private/content_decryptor_private.h
index 08b31a3075702da7497a3f126d153e98e5e7a660..629540abdb51afbf22bcd255341a896013b6ec81 100644
--- a/ppapi/cpp/private/content_decryptor_private.h
+++ b/ppapi/cpp/private/content_decryptor_private.h
@@ -29,6 +29,7 @@ class ContentDecryptor_Private {
   // strings. The change would allow the CDM wrapper to reuse vars when
   // replying to the browser.
   virtual void GenerateKeyRequest(const std::string& key_system,
+                                  const std::string& type,
                                   pp::VarArrayBuffer init_data) = 0;
   virtual void AddKey(const std::string& session_id,
                       pp::VarArrayBuffer key,