Make the request initiator Optional

content/common/resource_messages.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.
 
 // IPC messages for resource loading.
 //
 // NOTE: All messages must send an |int request_id| as their first parameter.
 
 // Multiply-included message file, hence no include guard.
 
@@ skipping 89 matching lines @@
 struct ParamTraits<scoped_refptr<net::ct::SignedCertificateTimestamp>> {
   typedef scoped_refptr<net::ct::SignedCertificateTimestamp> 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* r);
   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_
 
 
 #define IPC_MESSAGE_START ResourceMsgStart
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT CONTENT_EXPORT
 
 IPC_ENUM_TRAITS_MAX_VALUE( \
@@ skipping 256 matching lines @@
 
 // Sent when the renderer process deletes a resource loader.
 IPC_MESSAGE_CONTROL1(ResourceHostMsg_ReleaseDownloadedFile,
                      int /* request_id */)
 
 // Sent by the renderer when a resource request changes priority.
 IPC_MESSAGE_CONTROL3(ResourceHostMsg_DidChangePriority,
                      int /* request_id */,
                      net::RequestPriority,
                      int /* intra_priority_value */)