PPAPI: Force async callback invocation option.

ppapi/thunk/ppb_layer_compositor_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/pp_errors.h"
 #include "ppapi/c/dev/ppb_layer_compositor_dev.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_layer_compositor_api.h"
 #include "ppapi/thunk/resource_creation_api.h"
 
 namespace ppapi {
 namespace thunk {
 
 namespace {
 
 PP_Resource Create(PP_Instance instance) {
   return 0;
@@ skipping 19 matching lines @@
 
 void SetDisplay(PP_Resource compositor, PP_Resource layer,
                 PP_Bool is_displayed) {
 }
 
 void MarkAsDirty(PP_Resource compositor, PP_Resource layer) {
 }
 
 int32_t SwapBuffers(PP_Resource compositor,
                     struct PP_CompletionCallback callback) {
-  return PP_ERROR_FAILED;
+  return MayForceCallback(callback, PP_ERROR_FAILED);
 }
 
 const PPB_LayerCompositor_Dev g_ppb_layer_compositor_thunk = {
   &Create,
   &IsLayerCompositor,
   &AddLayer,
   &RemoveLayer,
   &SetZIndex,
   &SetRect,
   &SetDisplay,
   &MarkAsDirty,
   &SwapBuffers,
 };
 
 }  // namespace
 
 const PPB_LayerCompositor_Dev* GetPPB_LayerCompositor_Thunk() {
   return &g_ppb_layer_compositor_thunk;
 }
 
 }  // namespace thunk
 }  // namespace ppapi