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

ppapi/c/ppb_image_data.h

Index: ppapi/c/ppb_image_data.h
diff --git a/ppapi/c/ppb_image_data.h b/ppapi/c/ppb_image_data.h
index e8b42c484b5b0737964d5e4b06038914ff21e69a..0ed8e652bbc8f11db8888ed3003e146f0d26b1bf 100644
--- a/ppapi/c/ppb_image_data.h
+++ b/ppapi/c/ppb_image_data.h
@@ -3,7 +3,7 @@
  * found in the LICENSE file.
  */
 
-/* From ppb_image_data.idl modified Mon Aug 29 10:11:34 2011. */
+/* From ppb_image_data.idl modified Wed Oct  5 14:06:02 2011. */
 
 #ifndef PPAPI_C_PPB_IMAGE_DATA_H_
 #define PPAPI_C_PPB_IMAGE_DATA_H_
@@ -105,7 +105,7 @@ PP_COMPILE_ASSERT_STRUCT_SIZE_IN_BYTES(PP_ImageDataDesc, 16);
  * The <code>PPB_ImageData</code> interface contains pointers to several
  * functions for determining the browser's treatment of image data.
  */
-struct PPB_ImageData {
+struct PPB_ImageData_1_0 {
   /**
    * GetNativeImageDataFormat() returns the browser's preferred format for
    * image data. The browser uses this format internally for painting. Other
@@ -195,6 +195,8 @@ struct PPB_ImageData {
    */
   void (*Unmap)(PP_Resource image_data);
 };
+
+typedef struct PPB_ImageData_1_0 PPB_ImageData;
 /**
  * @}
  */