IDL: Autogenerate thunk for PPB_Gamepad.

ppapi/api/ppb_gamepad.idl

Index: ppapi/api/ppb_gamepad.idl
diff --git a/ppapi/api/ppb_gamepad.idl b/ppapi/api/ppb_gamepad.idl
index 845714b0848278456b6fd781e92d30e76bd54cc7..6403e345b08adc5e96170a059b01b1aca531b01e 100644
--- a/ppapi/api/ppb_gamepad.idl
+++ b/ppapi/api/ppb_gamepad.idl
@@ -8,6 +8,8 @@
  * provides access to gamepad devices.
  */
 
+[generate_thunk]
+
 label Chrome {
   M19 = 1.0
 };
@@ -83,7 +85,7 @@ struct PP_GamepadsSampleData {
  * 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.
@@ -91,5 +93,4 @@ interface PPB_Gamepad {
   void Sample(
       [in] PP_Instance instance,
       [out] PP_GamepadsSampleData data);
-
 };