PP_MakeOptionalCompletionCallback  150 ppapi/native_client/tests/ppapi_test_lib/test_interface.cc     PP_MakeOptionalCompletionCallback(func, user_data);
PP_MakeOptionalCompletionCallback  152 ppapi/native_client/tests/ppapi_test_lib/test_interface.cc   return PP_MakeOptionalCompletionCallback(CallbackWrapper, callback_info);