PPAPI: Make blocking completion callbacks work.

ppapi/thunk/ppb_talk_private_thunk.cc

 // Copyright (c) 2012 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 "ppapi/c/pp_errors.h"
 #include "ppapi/c/private/ppb_talk_private.h"
+#include "ppapi/shared_impl/tracked_callback.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_talk_private_api.h"
 #include "ppapi/thunk/thunk.h"
 
 namespace ppapi {
 namespace thunk {
 
 namespace {
 
 PP_Resource Create(PP_Instance instance) {
   EnterResourceCreation enter(instance);
   if (enter.failed())
     return 0;
   return enter.functions()->CreateTalk(instance);
 }
 
 int32_t GetPermission(PP_Resource resource,
                       PP_CompletionCallback callback) {
   EnterResource<PPB_Talk_Private_API> enter(resource, true);
   if (enter.failed())
     return PP_ERROR_BADRESOURCE;
-  return enter.object()->GetPermission(callback);
+  return enter.SetResult(enter.object()->GetPermission(enter.callback()));
 }
 
 const PPB_Talk_Private_1_0 g_ppb_talk_private_thunk = {
   &Create,
   &GetPermission
 };
 
 }  // namespace
 
 const PPB_Talk_Private_1_0* GetPPB_Talk_Private_1_0_Thunk() {
   return &g_ppb_talk_private_thunk;
 }
 
 }  // namespace thunk
 }  // namespace ppapi