PPAPI: Force async callback invocation option.

webkit/plugins/ppapi/ppb_layer_compositor_impl.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 "webkit/plugins/ppapi/ppb_layer_compositor_impl.h"
 
 #include "ppapi/c/pp_errors.h"
 #include "webkit/plugins/ppapi/common.h"
 
 namespace webkit {
@@ skipping 25 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 ppb_layercompositor = {
   &Create,
   &IsLayerCompositor,
   &AddLayer,
   &RemoveLayer,
   &SetZIndex,
   &SetRect,
   &SetDisplay,
@@ skipping 41 matching lines @@
 void PPB_LayerCompositor_Impl::MarkAsDirty(PP_Resource layer) {
 }
 
 int32_t PPB_LayerCompositor_Impl::SwapBuffers(
     struct PP_CompletionCallback callback) {
   return PP_ERROR_FAILED;
 }
 
 }  // namespace ppapi
 }  // namespace webkit