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

ppapi/c/dev/ppb_layer_compositor_dev.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.
  */
 #ifndef PPAPI_C_DEV_PPB_LAYER_COMPOSITOR_DEV_H_
 #define PPAPI_C_DEV_PPB_LAYER_COMPOSITOR_DEV_H_
 
 #include "ppapi/c/pp_bool.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_size.h"
 
 #define PPB_LAYER_COMPOSITOR_DEV_INTERFACE_0_2 "PPB_LayerCompositor(Dev);0.2"
 #define PPB_LAYER_COMPOSITOR_DEV_INTERFACE \
     PPB_LAYER_COMPOSITOR_DEV_INTERFACE_0_2
 
 // PPB_LayerCompositor allows multiple layers of PPB_Surface3D and
 // PPB_VideoLayer be bound to a plugin instance.
 //
 // Use PPB_Instance's BindGraphics() to bind a PPB_LayerCompositor to the
 // instance.
 //
 // This also allows each layer to be updated seperately to avoid excessive
 // compositing.
-struct PPB_LayerCompositor_Dev {
+struct PPB_LayerCompositor_Dev_0_2 {
   // Creates a video layer.
   PP_Resource (*Create)(PP_Instance instance);
 
   // Returns PP_TRUE if the input parameter is a PPB_LayerCompositor_Dev object.
   PP_Bool (*IsLayerCompositor)(PP_Resource resource);
 
   // Add a layer to be composited. Return PP_TRUE if |layer| is accepted.
   //
   // Note that after a PPB_Surface3D is added to this compositor, calling to
   // the layer's SwapBuffer() method will have no effect.
@@ skipping 31 matching lines @@
   // updates made available for compositing.
   //
   // Since this is an asynchronous operation, |callback| will be called when
   // this operation is done.
   //
   // Returns an error code from pp_errors.h.
   int32_t (*SwapBuffers)(PP_Resource compositor,
                          struct PP_CompletionCallback callback);
 };
 
+typedef struct PPB_LayerCompositor_Dev_0_2 PPB_LayerCompositor_Dev;
+
 #endif  /* PPAPI_C_DEV_PPB_LAYER_COMPOSITOR_DEV_H_ */