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

content/child/plugin_param_traits.h

Index: content/child/plugin_param_traits.h
diff --git a/content/child/plugin_param_traits.h b/content/child/plugin_param_traits.h
index b8495c63f87a08229c0bb66d23cb7f25357f3c5d..4e45b038c5aabc07164665000c7de02659cdc2c8 100644
--- a/content/child/plugin_param_traits.h
+++ b/content/child/plugin_param_traits.h
@@ -31,7 +31,9 @@ enum NPVariant_ParamEnum {
   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
@@ -49,6 +51,7 @@ struct NPVariant_Param {
   double double_value;
   std::string string_value;
   int npobject_routing_id;
+  int npobject_owner_id;
 };
 
 struct NPIdentifier_Param {