Allow MessageFilters to restrict listening to specific message classes

content/browser/media/android/browser_demuxer_android.cc

Index: content/browser/media/android/browser_demuxer_android.cc
diff --git a/content/browser/media/android/browser_demuxer_android.cc b/content/browser/media/android/browser_demuxer_android.cc
index 8480b14f98cda3087624db62dee06d88d06fb02f..de9099a55748be7b28290109e5efd5a55165c3fc 100644
--- a/content/browser/media/android/browser_demuxer_android.cc
+++ b/content/browser/media/android/browser_demuxer_android.cc
@@ -7,6 +7,11 @@
 #include "content/common/media/media_player_messages_android.h"
 
 namespace content {
+namespace {
+const uint32 kFilteredMessageClasses[] = {
+  MediaPlayerMsgStart,
+};
+}  // namespace
 
 class BrowserDemuxerAndroid::Internal : public media::DemuxerAndroid {
  public:
@@ -57,7 +62,9 @@ class BrowserDemuxerAndroid::Internal : public media::DemuxerAndroid {
   DISALLOW_COPY_AND_ASSIGN(Internal);
 };
 
-BrowserDemuxerAndroid::BrowserDemuxerAndroid() {}
+BrowserDemuxerAndroid::BrowserDemuxerAndroid()
+    : BrowserMessageFilter(
+          kFilteredMessageClasses, arraysize(kFilteredMessageClasses)) {}
 
 BrowserDemuxerAndroid::~BrowserDemuxerAndroid() {}