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 {
+namespace {
+const uint32 kFilteredMessageClasses[] = {
+  MediaPlayerMsgStart,
+};
+}  // namespace
 
 class BrowserDemuxerAndroid::Internal : public media::DemuxerAndroid {
  public:
   Internal(const scoped_refptr<BrowserDemuxerAndroid>& demuxer,
            int demuxer_client_id)
       : demuxer_(demuxer),
         demuxer_client_id_(demuxer_client_id) {}
 
   virtual ~Internal() {
     DCHECK(ClientIDExists()) << demuxer_client_id_;
@@ skipping 30 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(
+          kFilteredMessageClasses, arraysize(kFilteredMessageClasses)) {}
 
 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