Fix WebMStreamParser to continue parsing after a cluster end

media/formats/webm/cluster_builder.cc

Index: media/formats/webm/cluster_builder.cc
diff --git a/media/formats/webm/cluster_builder.cc b/media/formats/webm/cluster_builder.cc
index bada9e2f79c7406974d276a9066dcae71d088b65..1a3b358ef99c64989b658bdd67149710446556f6 100644
--- a/media/formats/webm/cluster_builder.cc
+++ b/media/formats/webm/cluster_builder.cc
@@ -6,6 +6,7 @@
 
 #include "base/logging.h"
 #include "media/base/data_buffer.h"
+#include "media/formats/webm/webm_constants.h"
 
 namespace media {
 
@@ -180,6 +181,16 @@ scoped_ptr<Cluster> ClusterBuilder::Finish() {
   return ret.Pass();
 }
 
+scoped_ptr<Cluster> ClusterBuilder::FinishWithUnknownSize() {
+  DCHECK_NE(cluster_timecode_, -1);
+
+  UpdateUInt64(kClusterSizeOffset, kWebMUnknownSize);
+
+  scoped_ptr<Cluster> ret(new Cluster(buffer_.Pass(), bytes_used_));
+  Reset();
+  return ret.Pass();
+}
+
 void ClusterBuilder::Reset() {
   buffer_size_ = kInitialBufferSize;
   buffer_.reset(new uint8[buffer_size_]);