Allow MessageFilters to restrict listening to specific message classes

content/browser/renderer_host/media/audio_renderer_host.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 "content/browser/renderer_host/media/audio_renderer_host.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/memory/shared_memory.h"
 #include "base/metrics/histogram.h"
@@ skipping 93 matching lines @@
 
 ///////////////////////////////////////////////////////////////////////////////
 // AudioRendererHost implementations.
 
 AudioRendererHost::AudioRendererHost(
     int render_process_id,
     media::AudioManager* audio_manager,
     AudioMirroringManager* mirroring_manager,
     MediaInternals* media_internals,
     MediaStreamManager* media_stream_manager)
-    : render_process_id_(render_process_id),
+    : BrowserMessageFilter(AudioMsgStart),
+      render_process_id_(render_process_id),
       audio_manager_(audio_manager),
       mirroring_manager_(mirroring_manager),
       audio_log_(media_internals->CreateAudioLog(
           media::AudioLogFactory::AUDIO_OUTPUT_CONTROLLER)),
       media_stream_manager_(media_stream_manager) {
   DCHECK(audio_manager_);
   DCHECK(media_stream_manager_);
 }
 
 AudioRendererHost::~AudioRendererHost() {
@@ skipping 331 matching lines @@
 }
 
 AudioRendererHost::AudioEntry* AudioRendererHost::LookupById(int stream_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   AudioEntryMap::const_iterator i = audio_entries_.find(stream_id);
   return i != audio_entries_.end() ? i->second : NULL;
 }
 
 }  // namespace content