PPAPI: Force async callback invocation option.

ppapi/proxy/ppb_audio_proxy.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/proxy/ppb_audio_proxy.h"
 
 #include "base/threading/simple_thread.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppb_audio.h"
 #include "ppapi/c/ppb_audio_config.h"
@@ skipping 189 matching lines @@
 
   // Make an audio config object.
   PP_Resource audio_config_res =
       resource_creation.functions()->CreateAudioConfig(
           instance_id, static_cast<PP_AudioSampleRate>(sample_rate),
           sample_frame_count);
   if (!audio_config_res)
     return;
 
   // Initiate opening the audio object.
-  CompletionCallback callback = callback_factory_.NewCallback(
+  CompletionCallback callback = callback_factory_.NewOptionalCallback(
       &PPB_Audio_Proxy::AudioChannelConnected, *result);
   int32_t open_error = trusted_audio.object()->OpenTrusted(
       audio_config_res, callback.pp_completion_callback());
   if (open_error != PP_OK_COMPLETIONPENDING)
     callback.Run(open_error);
 
   // Clean up the temporary audio config resource we made.
   const PPB_Core* core = static_cast<const PPB_Core*>(
       dispatcher()->GetLocalInterface(PPB_CORE_INTERFACE));
   core->ReleaseResource(audio_config_res);
@@ skipping 88 matching lines @@
   *foreign_shared_memory_handle = dispatcher()->ShareHandleWithRemote(
       IntToPlatformFile(shared_memory_handle), false);
   if (*foreign_shared_memory_handle == IPC::InvalidPlatformFileForTransit())
     return PP_ERROR_FAILED;
 
   return PP_OK;
 }
 
 }  // namespace proxy
 }  // namespace pp