New thunk system for Pepper proxy and implementation

ppapi/proxy/plugin_resource.h

Index: ppapi/proxy/plugin_resource.h
===================================================================
--- ppapi/proxy/plugin_resource.h	(revision 84344)
+++ ppapi/proxy/plugin_resource.h	(working copy)
@@ -10,6 +10,7 @@
 #include "ppapi/proxy/host_resource.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
 #include "ppapi/proxy/plugin_resource_tracker.h"
+#include "ppapi/shared_impl/resource_object_base.h"
 
 // If you inherit from resource, make sure you add the class name here.
 #define FOR_ALL_PLUGIN_RESOURCES(F)                   \
@@ -41,7 +42,7 @@
 FOR_ALL_PLUGIN_RESOURCES(DECLARE_RESOURCE_CLASS)
 #undef DECLARE_RESOURCE_CLASS
 
-class PluginResource {
+class PluginResource : public ::ppapi::shared_impl::ResourceObjectBase {
  public:
   PluginResource(const HostResource& resource);
   virtual ~PluginResource();
@@ -62,6 +63,8 @@
     return host_resource_;
   }
 
+  PluginDispatcher* GetDispatcher();
+
  private:
   // Type-specific getters for individual resource types. These will return
   // NULL if the resource does not match the specified type. Used by the Cast()