PPAPI: Make blocking completion callbacks work.

ppapi/thunk/ppb_graphics_3d_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_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/thunk.h"
 #include "ppapi/thunk/ppb_graphics_3d_api.h"
 #include "ppapi/thunk/resource_creation_api.h"
@@ skipping 52 matching lines @@
   EnterGraphics3D enter(graphics_3d, true);
   if (enter.failed())
     return enter.retval();
   return enter.object()->ResizeBuffers(width, height);
 }
 
 int32_t SwapBuffers(PP_Resource graphics_3d, PP_CompletionCallback callback) {
   EnterGraphics3D enter(graphics_3d, callback, true);
   if (enter.failed())
     return enter.retval();
-  return enter.SetResult(enter.object()->SwapBuffers(callback));
+  return enter.SetResult(enter.object()->SwapBuffers(enter.callback()));
 }
 
 const PPB_Graphics3D g_ppb_graphics_3d_thunk = {
   &GetAttribMaxValue,
   &Create,
   &IsGraphics3D,
   &GetAttribs,
   &SetAttribs,
   &GetError,
   &ResizeBuffers,
   &SwapBuffers
 };
 
 }  // namespace
 
 const PPB_Graphics3D_1_0* GetPPB_Graphics3D_1_0_Thunk() {
   return &g_ppb_graphics_3d_thunk;
 }
 
 }  // namespace thunk
 }  // namespace ppapi