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

ppapi/native_client/tests/ppapi_example_audio/audio.cc

 // 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.
 //
 
 #include <nacl/nacl_log.h>
 
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ skipping 133 matching lines @@
 
   // To enable basic tests, use basic_tests="1" in the embed tag.
   void BasicTests() {
     // Verify obtained_sample_frame_count isn't out of range.
     CHECK(obtained_sample_frame_count_ >= PP_AUDIOMINSAMPLEFRAMECOUNT);
     CHECK(obtained_sample_frame_count_ <= PP_AUDIOMAXSAMPLEFRAMECOUNT);
     // Do some sanity checks below; verify c & cpp interfaces agree.
     // Note: This is test code and is not normally needed for an application.
     PPB_GetInterface get_browser_interface =
         pp::Module::Get()->get_browser_interface();
-    const struct PPB_AudioConfig* audio_config_interface =
-        static_cast<const struct PPB_AudioConfig*>(
+    const PPB_AudioConfig* audio_config_interface =
+        static_cast<const PPB_AudioConfig*>(
         get_browser_interface(PPB_AUDIO_CONFIG_INTERFACE));
-    const struct PPB_Audio* audio_interface =
-        static_cast<const struct PPB_Audio*>(
+    const PPB_Audio* audio_interface =
+        static_cast<const PPB_Audio*>(
         get_browser_interface(PPB_AUDIO_INTERFACE));
     PP_Resource audio_config_resource = config_->pp_resource();
     PP_Resource audio_resource = audio_->pp_resource();
     NaClLog(1, "example: audio config resource: %"NACL_PRId32"\n",
             audio_config_resource);
     NaClLog(1, "example: audio resource: %"NACL_PRId32"\n", audio_resource);
     CHECK(PP_TRUE == audio_config_interface->
         IsAudioConfig(audio_config_resource));
     CHECK(PP_TRUE == audio_interface->IsAudio(audio_resource));
     CHECK(PP_FALSE == audio_config_interface->IsAudioConfig(audio_resource));
@@ skipping 124 matching lines @@
 
 namespace pp {
 
 // Factory function for your specialization of the Module object.
 Module* CreateModule() {
   NaClLogModuleInit();
   return new MyModule();
 }
 
 }  // namespace pp