IDL: Autogenerate thunk for PPB_Gamepad.

ppapi/api/ppb_gamepad.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 <code>PPB_Gamepad</code> interface, which
  * provides access to gamepad devices.
  */
 
+[generate_thunk]
+
 label Chrome {
   M19 = 1.0
 };
 
 /**
  * The data for one gamepad device.
  */
 [assert_size(472)]
 struct PP_GamepadSampleData {
     /**
@@ skipping 55 matching lines @@
     /**
      * Data for an individual gamepad device connected to the system.
      */
     PP_GamepadSampleData[4] items;
 };
 
 /**
  * The <code>PPB_Gamepad</code> interface allows retrieving data from
  * gamepad/joystick devices that are connected to the system.
  */
-[version=1.0, macro="PPB_GAMEPAD_INTERFACE"]
+[version=1.0, macro="PPB_GAMEPAD_INTERFACE", singleton_resource]
 interface PPB_Gamepad {
   /**
    * Samples the current state of the connected gamepads.
    */
   void Sample(
       [in] PP_Instance instance,
       [out] PP_GamepadsSampleData data);
-
 };