Add a way to implement GetInterface in the broker.

ppapi/api/ppp.idl

 /* Copyright (c) 2012 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 defines three functions that your module must
  * implement to interact with the browser.
  */
 
@@ skipping 103 matching lines @@
 /**
  * @}
  */
 
 #ifdef __cplusplus
 }  /* extern "C" */
 #endif
 
 #endinl
 
+/**
+ * Defines the type of the <code>PPP_InitializeModule</code> function.
+ */
+typedef int32_t PP_InitializeModule_Func([in] PP_Module module,
+                                         [in] PPB_GetInterface get_interface);
+
+/**
+ * Defines the type of the <code>PPP_ShutdownModule</code> function.
+ */
+typedef interface_t PP_GetInterface_Func([in] str_t interface_name);
+
+/**
+ * Defines the type of the <code>PPP_ShutdownModule</code> function.
+ */
+typedef void PP_ShutdownModule_Func();