Make the request initiator Optional

content/common/resource_messages.h

Index: content/common/resource_messages.h
diff --git a/content/common/resource_messages.h b/content/common/resource_messages.h
index 6812be78ea8550c09bbde4c7f66cbdf69cb025e6..da6ddcf88a8768eb33e0554dc5e9f7ff1b299ad0 100644
--- a/content/common/resource_messages.h
+++ b/content/common/resource_messages.h
@@ -107,6 +107,17 @@ struct ParamTraits<scoped_refptr<net::ct::SignedCertificateTimestamp>> {
   static void Log(const param_type& p, std::string* l);
 };
 
+template <>
+struct ParamTraits<scoped_refptr<url::NullableOrigin>> {

[nasko, 2016/10/10 22:28:11]

Why not place this next to the ParamTraits for url::Origin? After all, this one
inherits url::Origin. Is it because it is content/public/? Would we need it
outside of content/ to handle the omnibox, browser-initiated navigation?

+  typedef scoped_refptr<url::NullableOrigin> param_type;
+  static void GetSize(base::PickleSizer* s, const param_type& p);
+  static void Write(base::Pickle* m, const param_type& p);
+  static bool Read(const base::Pickle* m,
+                   base::PickleIterator* iter,
+                   param_type* p);
+  static void Log(const param_type& p, std::string* l);
+};
+
 }  // namespace IPC
 
 #endif  // CONTENT_COMMON_RESOURCE_MESSAGES_H_