Started on Resource class.

src/shared/ppapi_proxy/plugin_audio_config.cc

 /*
  * Copyright 2010 The Native Client 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 "native_client/src/shared/ppapi_proxy/plugin_audio_config.h"
 
 #include <stdio.h>
 #include <string.h>
@@ skipping 14 matching lines @@
   UNREFERENCED_PARAMETER(sample_rate);
   UNREFERENCED_PARAMETER(sample_frame_count);
   return kInvalidResourceId;
 }
 
 uint32_t RecommendSampleFrameCount(uint32_t request_sample_frame_count) {
   UNREFERENCED_PARAMETER(request_sample_frame_count);
   return 0;
 }
 
-PP_Bool IsAudioConfig(PP_Resource config) {
-  UNREFERENCED_PARAMETER(config);
-  return PP_FALSE;
+PP_Bool IsAudioConfig(PP_Resource resource) {
+  return PluginResource::GetAs<PluginAudioConfig>(resource).get()
+      ? PP_TRUE : PP_FALSE;
 }
 
 PP_AudioSampleRate_Dev GetSampleRate(PP_Resource config) {
   UNREFERENCED_PARAMETER(config);
   return PP_AUDIOSAMPLERATE_NONE;
 }
 
 uint32_t GetSampleFrameCount(PP_Resource config) {
   UNREFERENCED_PARAMETER(config);
   return PP_AUDIOMINSAMPLEFRAMECOUNT;
 }
 }  // namespace
 
 const PPB_AudioConfig_Dev* PluginAudioConfig::GetInterface() {
   static const PPB_AudioConfig_Dev intf = {
     CreateStereo16Bit,
     RecommendSampleFrameCount,
     IsAudioConfig,
     GetSampleRate,
     GetSampleFrameCount,
   };
   return &intf;
 }
 
 }  // namespace ppapi_proxy