Track NPObject ownership by the originating plugins' NPP identifier. [4/6] (Chrome)

content/child/plugin_param_traits.h

 // Copyright 2013 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
@@ skipping 13 matching lines @@
 // Define the NPVariant_Param struct and its enum here since it needs manual
 // serialization code.
 enum NPVariant_ParamEnum {
   NPVARIANT_PARAM_VOID,
   NPVARIANT_PARAM_NULL,
   NPVARIANT_PARAM_BOOL,
   NPVARIANT_PARAM_INT,
   NPVARIANT_PARAM_DOUBLE,
   NPVARIANT_PARAM_STRING,
   // Used when when the NPObject is running in the caller's process, so we
-  // create an NPObjectProxy in the other process.
+  // create an NPObjectProxy in the other process. To support object ownership
+  // tracking the routing-Id of the NPObject's owning plugin instance is
+  // passed alongside that of the object itself.
   NPVARIANT_PARAM_SENDER_OBJECT_ROUTING_ID,
   // Used when the NPObject we're sending is running in the callee's process
   // (i.e. we have an NPObjectProxy for it).  In that case we want the callee
   // to just use the raw pointer.
   NPVARIANT_PARAM_RECEIVER_OBJECT_ROUTING_ID,
 };
 
 struct NPVariant_Param {
   NPVariant_Param();
   ~NPVariant_Param();
 
   NPVariant_ParamEnum type;
   bool bool_value;
   int int_value;
   double double_value;
   std::string string_value;
   int npobject_routing_id;
+  int npobject_owner_id;
 };
 
 struct NPIdentifier_Param {
   NPIdentifier_Param();
   ~NPIdentifier_Param();
 
   NPIdentifier identifier;
 };
 
 }  // namespace content
@@ skipping 12 matching lines @@
 struct ParamTraits<content::NPIdentifier_Param> {
   typedef content::NPIdentifier_Param param_type;
   static void Write(Message* m, const param_type& p);
   static bool Read(const Message* m, PickleIterator* iter, param_type* r);
   static void Log(const param_type& p, std::string* l);
 };
 
 }  // namespace IPC
 
 #endif  // CONTENT_CHILD_PLUGIN_PARAM_TRAITS_H_