HTML MessagePort as mojo::MessagePipeHandle

content/common/content_param_traits.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.
 
 // This file is used to define IPC::ParamTraits<> specializations for a number
 // of types so that they can be serialized over IPC.  IPC::ParamTraits<>
 // specializations for basic types (like int and std::string) and types in the
 // 'base' project can be found in ipc/ipc_message_utils.h.  This file contains
 // specializations for types that are used by the content code, and which need
 // manual serialization code.  This is usually because they're not structs with
 // public members, or because the same type is being used in multiple
 // *_messages.h headers.
 
 #ifndef CONTENT_COMMON_CONTENT_PARAM_TRAITS_H_
 #define CONTENT_COMMON_CONTENT_PARAM_TRAITS_H_
 
 #include "content/common/content_param_traits_macros.h"
 #include "content/common/cursors/webcursor.h"
 #include "third_party/WebKit/public/platform/WebInputEvent.h"
 
+namespace content {
+class MessagePort;
+}
+
 namespace IPC {
 
 template <>
 struct ParamTraits<content::WebCursor> {
   typedef content::WebCursor param_type;
   static void Write(base::Pickle* m, const param_type& p) { p.Serialize(m); }
   static bool Read(const base::Pickle* m,
                    base::PickleIterator* iter,
                    param_type* r) {
     return r->Deserialize(iter);
   }
   static void Log(const param_type& p, std::string* l) {
     l->append("<WebCursor>");
   }
 };
 
 typedef const blink::WebInputEvent* WebInputEventPointer;
 template <>
 struct ParamTraits<WebInputEventPointer> {
   typedef WebInputEventPointer param_type;
   static void GetSize(base::PickleSizer* s, const param_type& p);
   static void Write(base::Pickle* m, const param_type& p);
   // Note: upon read, the event has the lifetime of the message.
   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 CONTENT_EXPORT ParamTraits<content::MessagePort> {
+  typedef content::MessagePort param_type;
+  static void GetSize(base::PickleSizer* sizer, 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);
+};
+
 }  // namespace IPC
 
 #endif  // CONTENT_COMMON_CONTENT_PARAM_TRAITS_H_