Update PPAPI IDL generator to define versioned structs, and unversioned typedef.

ppapi/c/ppb_audio.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.
  */
 
-/* From ppb_audio.idl modified Mon Aug 29 10:11:34 2011. */
+/* From ppb_audio.idl modified Wed Oct  5 14:06:02 2011. */
 
 #ifndef PPAPI_C_PPB_AUDIO_H_
 #define PPAPI_C_PPB_AUDIO_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_macros.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_stdint.h"
 
@@ skipping 54 matching lines @@
  *     PP_AUDIOSAMPLERATE_44100, 4096);
  * PP_Resource pp_audio_config = audio_config_interface->CreateStereo16Bit(
  *     pp_instance, PP_AUDIOSAMPLERATE_44100, count);
  * PP_Resource pp_audio = audio_interface->Create(pp_instance, pp_audio_config,
  *     audio_callback, NULL);
  * audio_interface->StartPlayback(pp_audio);
  *
  * ...audio_callback() will now be periodically invoked on a separate thread...
  * </code>
  */
-struct PPB_Audio {
+struct PPB_Audio_1_0 {
   /**
    * Create() creates an audio resource. No sound will be heard until
    * StartPlayback() is called. The callback is called with the buffer address
    * and given user data whenever the buffer needs to be filled. From within the
    * callback, you should not call <code>PPB_Audio</code> functions. The
    * callback will be called on a different thread than the one which created
    * the interface. For performance-critical applications (i.e. low-latency
    * audio), the callback should avoid blocking or calling functions that can
    * obtain locks, such as malloc. The layout and the size of the buffer passed
    * to the audio callback will be determined by the device configuration and is
@@ skipping 57 matching lines @@
    * resource.
    *
    * @return A <code>PP_Bool</code> containing <code>PP_TRUE</code> if
    * successful, otherwise <code>PP_FALSE</code>. Also returns
    * <code>PP_TRUE</code> (and is a no-op) if called while playback is already
    * stopped. If a callback is in progress, StopPlayback() will block until the
    * callback completes.
    */
   PP_Bool (*StopPlayback)(PP_Resource audio);
 };
+
+typedef struct PPB_Audio_1_0 PPB_Audio;
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PPB_AUDIO_H_ */