Keep the module in scope when executing scripts. This prevents a crash when the

ppapi/c/private/ppb_proxy_private.h

 // Copyright (c) 2011 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.
 
 #ifndef PPAPI_C_PRIVATE_PROXY_PRIVATE_H_
 #define PPAPI_C_PRIVATE_PROXY_PRIVATE_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_module.h"
@@ skipping 20 matching lines @@
   // On failure (returns false), the host implementation will generate a new
   // instance ID and try again.
   void (*SetReserveInstanceIDCallback)(
       PP_Module module,
       PP_Bool (*is_seen)(PP_Module, PP_Instance));
 
   // Returns the number of bytes synchronously readable out of the URLLoader's
   // buffer. Returns 0 on failure or if the url loader doesn't have any data
   // now.
   int32_t (*GetURLLoaderBufferedBytes)(PP_Resource url_loader);
+
+  // Allows adding additional refcounts to the PluginModule that owns the
+  // proxy dispatcher (and all interface proxies). For every AddRef call
+  // there must be a corresponding release call.
+  void (*AddRefModule)(PP_Module module);
+  void (*ReleaseModule)(PP_Module module);
 };
 
 #endif  // PPAPI_C_PRIVATE_PROXY_PRIVATE_H_