Fix WebMStreamParser to handle Cues between Clusters correctly.

media/formats/webm/webm_stream_parser.cc

Index: media/formats/webm/webm_stream_parser.cc
diff --git a/media/formats/webm/webm_stream_parser.cc b/media/formats/webm/webm_stream_parser.cc
index 3f370daa8000f24f7ed266537a3d5cb2cbfbbc89..8fd303aa700ababe2164674e3201f0394a6b96ee 100644
--- a/media/formats/webm/webm_stream_parser.cc
+++ b/media/formats/webm/webm_stream_parser.cc
@@ -151,6 +151,13 @@ int WebMStreamParser::ParseInfoAndTracks(const uint8* data, int size) {
       // Skip the element.
       return result + element_size;
       break;
+    case kWebMIdCluster:
+      if (!cluster_parser_) {
+        MEDIA_LOG(log_cb_) << "Found Cluster element before Info.";
+        return -1;
+      }
+      ChangeState(kParsingClusters);
+      return 0;
     case kWebMIdSegment:
       // Segment of unknown size indicates live stream.
       if (element_size == kWebMUnknownSize)