Make Graphics3D::SwapBuffers take a completion callback

ppapi/cpp/dev/surface_3d_dev.cc

 // Copyright (c) 2010 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/cpp/dev/surface_3d_dev.h"
 
 #include "ppapi/c/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/module_impl.h"
@@ skipping 20 matching lines @@
                              PP_Config3D_Dev config,
                              const int32_t* attrib_list) {
   if (has_interface<PPB_Surface3D_Dev>()) {
     PassRefFromConstructor(get_interface<PPB_Surface3D_Dev>()->Create(
         instance.pp_instance(),
         config,
         attrib_list));
   }
 }
 
-int32_t Surface3D_Dev::SwapBuffers() const {
+int32_t Surface3D_Dev::SwapBuffers(const CompletionCallback& cc) const {
   if (!has_interface<PPB_Surface3D_Dev>())
     return PP_ERROR_NOINTERFACE;
 
   return get_interface<PPB_Surface3D_Dev>()->SwapBuffers(
       pp_resource(),
-      PP_BlockUntilComplete());
+      cc.pp_completion_callback());
 }
 
 }  // namespace pp