PPAPI: Force async callback invocation option.

ppapi/thunk/ppb_file_chooser_thunk.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 "ppapi/c/dev/ppb_file_chooser_dev.h"
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
+#include "ppapi/thunk/common.h"
+#include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/thunk.h"
-#include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/ppb_file_chooser_api.h"
 #include "ppapi/thunk/resource_creation_api.h"
 
 namespace ppapi {
 namespace thunk {
 
 namespace {
 
 PP_Resource Create(PP_Instance instance,
                    const PP_FileChooserOptions_Dev* options) {
   EnterFunction<ResourceCreationAPI> enter(instance, true);
   if (enter.failed())
     return 0;
   return enter.functions()->CreateFileChooser(instance, options);
 }
 
 PP_Bool IsFileChooser(PP_Resource resource) {
   EnterResource<PPB_FileChooser_API> enter(resource, false);
   return PP_FromBool(enter.succeeded());
 }
 
 int32_t Show(PP_Resource chooser, PP_CompletionCallback callback) {
   EnterResource<PPB_FileChooser_API> enter(chooser, true);
   if (enter.failed())
-    return PP_ERROR_BADRESOURCE;
-  return enter.object()->Show(callback);
+    return MayForceCallback(callback, PP_ERROR_BADRESOURCE);
+  int32_t result = enter.object()->Show(callback);
+  return MayForceCallback(callback, result);
 }
 
 PP_Resource GetNextChosenFile(PP_Resource chooser) {
   EnterResource<PPB_FileChooser_API> enter(chooser, true);
   if (enter.failed())
     return 0;
   return enter.object()->GetNextChosenFile();
 }
 
 const PPB_FileChooser_Dev g_ppb_file_chooser_thunk = {
   &Create,
   &IsFileChooser,
   &Show,
   &GetNextChosenFile
 };
 
 }  // namespace
 
 const PPB_FileChooser_Dev* GetPPB_FileChooser_Thunk() {
   return &g_ppb_file_chooser_thunk;
 }
 
 }  // namespace thunk
 }  // namespace ppapi