Allow MessageFilters to restrict listening to specific message classes

content/browser/media/android/browser_demuxer_android.cc

 // Copyright 2013 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/media/android/browser_demuxer_android.h"
 
 #include "content/common/media/media_player_messages_android.h"
 
 namespace content {
 
@@ skipping 39 matching lines @@
   bool ClientIDExists() {
     return demuxer_->demuxer_clients_.Lookup(demuxer_client_id_);
   }
 
   scoped_refptr<BrowserDemuxerAndroid> demuxer_;
   int demuxer_client_id_;
 
   DISALLOW_COPY_AND_ASSIGN(Internal);
 };
 
-BrowserDemuxerAndroid::BrowserDemuxerAndroid() {}
+BrowserDemuxerAndroid::BrowserDemuxerAndroid()
+    : BrowserMessageFilter(MediaPlayerMsgStart) {}
 
 BrowserDemuxerAndroid::~BrowserDemuxerAndroid() {}
 
 void BrowserDemuxerAndroid::OverrideThreadForMessage(
     const IPC::Message& message,
     BrowserThread::ID* thread) {
   switch (message.type()) {
     case MediaPlayerHostMsg_DemuxerReady::ID:
     case MediaPlayerHostMsg_ReadFromDemuxerAck::ID:
     case MediaPlayerHostMsg_DurationChanged::ID:
@@ skipping 68 matching lines @@
 
 void BrowserDemuxerAndroid::OnDurationChanged(int demuxer_client_id,
                                               const base::TimeDelta& duration) {
   media::DemuxerAndroidClient* client =
       demuxer_clients_.Lookup(demuxer_client_id);
   if (client)
     client->OnDemuxerDurationChanged(duration);
 }
 
 }  // namespace content