Purge AudioOutputDispatcher after close delay if no proxies exist.

media/audio/audio_output_dispatcher_impl.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 "media/audio/audio_output_dispatcher_impl.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 112 matching lines @@
 
   // Close all idle streams immediately.  The |close_timer_| will handle
   // invalidating any outstanding tasks upon its destruction.
   CloseAllIdleStreams();
 
   // No AudioOutputProxy objects should hold a reference to us when we get
   // to this stage.
   DCHECK(HasOneRef()) << "Only the AudioManager should hold a reference";
 }
 
+bool AudioOutputDispatcherImpl::HasOutputProxies() const {
+  return idle_proxies_ || !proxy_to_physical_map_.empty();
+}
+
 bool AudioOutputDispatcherImpl::CreateAndOpenStream() {
   DCHECK(task_runner_->BelongsToCurrentThread());
   AudioOutputStream* stream = audio_manager_->MakeAudioOutputStream(
       params_, device_id_);
   if (!stream)
     return false;
 
   if (!stream->Open()) {
     stream->Close();
     return false;
@@ skipping 23 matching lines @@
 
     AudioStreamIDMap::iterator it = audio_stream_ids_.find(stream);
     DCHECK(it != audio_stream_ids_.end());
     audio_log_->OnClosed(it->second);
     audio_stream_ids_.erase(it);
   }
   idle_streams_.erase(idle_streams_.begin() + keep_alive, idle_streams_.end());
 }
 
 }  // namespace media