Started on Resource class.

src/shared/ppapi_proxy/plugin_buffer.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_buffer.h"
 
 #include <stdio.h>
 #include <string.h>
 #include "gen/native_client/src/shared/ppapi_proxy/ppb_rpc.h"
 #include "native_client/src/include/portability.h"
 #include "native_client/src/shared/ppapi_proxy/plugin_globals.h"
 #include "native_client/src/shared/ppapi_proxy/utility.h"
 #include "native_client/src/shared/srpc/nacl_srpc.h"
 #include "ppapi/c/dev/ppb_buffer_dev.h"
 
 namespace ppapi_proxy {
 
 namespace {
 PP_Resource Create(PP_Module module, int32_t size_in_bytes) {
   UNREFERENCED_PARAMETER(module);
   UNREFERENCED_PARAMETER(size_in_bytes);
   return kInvalidResourceId;
 }
 
 PP_Bool IsBuffer(PP_Resource resource) {
-  UNREFERENCED_PARAMETER(resource);
-  return PP_FALSE;
+  return PluginResource::GetAs<PluginBuffer>(resource).get()
+      ? PP_TRUE : PP_FALSE;
 }
 
 PP_Bool Describe(PP_Resource resource, int32_t* size_in_bytes) {
   UNREFERENCED_PARAMETER(resource);
   UNREFERENCED_PARAMETER(size_in_bytes);
   return PP_FALSE;
 }
 
 void* Map(PP_Resource resource) {
   UNREFERENCED_PARAMETER(resource);
@@ skipping 10 matching lines @@
     Create,
     IsBuffer,
     Describe,
     Map,
     Unmap,
   };
   return &intf;
 }
 
 }  // namespace ppapi_proxy