Hide knowledge of webkit::ppapi::Plugin from chrome. This is part of moving ppapi implementation fr…

ppapi/api/private/ppb_instance_private.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 the PPB_Instance_Private interface implemented by the
  * browser and containing pointers to functions available only to trusted plugin
  * instances.
  */
 
 [generate_thunk]
 
 label Chrome {
   M13 = 0.1
 };
 
 /**
+ * The <code>PP_ExternalPluginResult </code> enum contains result codes from
+ * launching an external plugin.
+ */
+[assert_size(4)]
+enum PP_ExternalPluginResult  {
+  /** Successful external plugin call */
+  PP_EXTERNAL_PLUGIN_OK = 0,
+  /** Unspecified external plugin error */
+  PP_EXTERNAL_PLUGIN_FAILED = 1,
+  /** Error creating the module */
+  PP_EXTERNAL_PLUGIN_ERROR_MODULE = 2,
+  /** Error creating and initializing the instance */
+  PP_EXTERNAL_PLUGIN_ERROR_INSTANCE = 3
+};
+
+
+/**
  * The PPB_Instance_Private interface contains functions available only to
  * trusted plugin instances.
  *
  */
 interface PPB_Instance_Private {
   /**
    * GetWindowObject is a pointer to a function that determines
    * the DOM window containing this module instance.
    *
    * @param[in] instance A PP_Instance whose WindowObject should be retrieved.
@@ skipping 25 matching lines @@
    * this to NULL if you don't want exception info; initialize this to a void
    * exception if want exception info.
    *
    * @return The result of the script execution, or a "void" var
    * if execution failed.
    */
   PP_Var ExecuteScript([in] PP_Instance instance,
                        [in] PP_Var script,
                        [out] PP_Var exception);
 };