Preserves NPObject identity for objects created in a plugin and passed to JavaScript.

content/plugin/plugin_channel_base.h

Index: content/plugin/plugin_channel_base.h
===================================================================
--- content/plugin/plugin_channel_base.h	(revision 86681)
+++ content/plugin/plugin_channel_base.h	(working copy)
@@ -22,6 +22,28 @@
 class MessageLoopProxy;
 }
 
+#if defined(COMPILER_GCC)
+namespace __gnu_cxx {
+
+template<>
+struct hash<NPObject*> {
+  std::size_t operator()(NPObject* const& ptr) const {
+    return hash<size_t>()(reinterpret_cast<size_t>(ptr));
+  }
+};
+
+}  // namespace __gnu_cxx
+#elif defined(COMPILER_MSVC)
+namespace stdext {
+
+template<>
+inline size_t hash_value(NPObject* const& ptr) {
+  return hash_value(reinterpret_cast<size_t>(ptr));
+}
+
+}  // namespace stdext
+#endif // COMPILER
+
 // Encapsulates an IPC channel between a renderer and a plugin process.
 class PluginChannelBase : public IPC::Channel::Listener,
                           public IPC::Message::Sender,
@@ -38,6 +60,17 @@
                 NPObjectBase* npobject);
   void RemoveRoute(int route_id);
 
+
+  void AddMappingForNPObjectProxy(int route_id, NPObject* object);
+  void RemoveMappingForNPObjectProxy(int route_id);
+
+  void AddMappingForNPObjectStub(int route_id, NPObject* object);
+  void RemoveMappingForNPObjectStub(int route_id, NPObject* object);
+
+  NPObject* GetExistingNPObjectProxy(int route_id);
+  int GetExistingRouteForNPObjectStub(NPObject* npobject);
+
+
   // IPC::Message::Sender implementation:
   virtual bool Send(IPC::Message* msg);
 
@@ -122,6 +155,12 @@
   typedef base::hash_map<int, NPObjectBase*> ListenerMap;
   ListenerMap npobject_listeners_;
 
+  typedef base::hash_map<int, NPObject*> ProxyMap;
+  ProxyMap proxy_map_;
+
+  typedef base::hash_map<NPObject*, int> StubMap;
+  StubMap stub_map_;
+
   // Used to implement message routing functionality to WebPlugin[Delegate]
   // objects
   MessageRouter router_;