Add live mode detection in WebM MediaSource parser.

media/filters/chunk_demuxer.cc

Index: media/filters/chunk_demuxer.cc
diff --git a/media/filters/chunk_demuxer.cc b/media/filters/chunk_demuxer.cc
index e6caaebc35ca68f420fab3b60cfb8a50119f2e8f..d2a2b649556eb2acff80a90f865ab77c35466663 100644
--- a/media/filters/chunk_demuxer.cc
+++ b/media/filters/chunk_demuxer.cc
@@ -974,6 +974,7 @@ ChunkDemuxer::ChunkDemuxer(const base::Closure& open_cb,
       log_cb_(log_cb),
       duration_(kNoTimestamp()),
       user_specified_duration_(-1),
+      liveness_(LIVENESS_UNKNOWN),
       splice_frames_enabled_(splice_frames_enabled) {
   DCHECK(!open_cb_.is_null());
   DCHECK(!need_key_cb_.is_null());
@@ -1064,6 +1065,10 @@ base::Time ChunkDemuxer::GetTimelineOffset() const {
   return timeline_offset_;
 }
 
+Demuxer::Liveness ChunkDemuxer::GetLiveness() const {
+  return liveness_;
+}
+
 void ChunkDemuxer::StartWaitingForSeek(TimeDelta seek_time) {
   DVLOG(1) << "StartWaitingForSeek()";
   base::AutoLock auto_lock(lock_);
@@ -1508,6 +1513,17 @@ void ChunkDemuxer::OnSourceInitDone(
     timeline_offset_ = params.timeline_offset;
   }
 
+  if (params.liveness != LIVENESS_UNKNOWN) {
+    if (liveness_ != LIVENESS_UNKNOWN && params.liveness != liveness_) {
+      MEDIA_LOG(log_cb_)
+          << "Liveness is not the same across all SourceBuffers.";
+      ReportError_Locked(DEMUXER_ERROR_COULD_NOT_OPEN);
+      return;
+    }
+
+    liveness_ = params.liveness;
+  }
+
   // Wait until all streams have initialized.
   if ((!source_id_audio_.empty() && !audio_) ||
       (!source_id_video_.empty() && !video_)) {