Add live mode detection in WebM MediaSource parser.

media/formats/webm/webm_tracks_parser.h

Index: media/formats/webm/webm_tracks_parser.h
diff --git a/media/formats/webm/webm_tracks_parser.h b/media/formats/webm/webm_tracks_parser.h
index 61d79af84fa25f5d3cbba0a2c52c9ed55154ee39..367e366509c67c69825655deb35eeb068cfb9f44 100644
--- a/media/formats/webm/webm_tracks_parser.h
+++ b/media/formats/webm/webm_tracks_parser.h
@@ -27,7 +27,9 @@ namespace media {
 // Parser for WebM Tracks element.
 class MEDIA_EXPORT WebMTracksParser : public WebMParserClient {
  public:
-  explicit WebMTracksParser(const LogCB& log_cb, bool ignore_text_tracks);
+  WebMTracksParser(const LogCB& log_cb,
+                   bool ignore_text_tracks,
+                   bool live_mode);
   virtual ~WebMTracksParser();
 
   // Parses a WebM Tracks element in |buf|.
@@ -82,6 +84,8 @@ class MEDIA_EXPORT WebMTracksParser : public WebMParserClient {
   virtual bool OnBinary(int id, const uint8* data, int size) OVERRIDE;
   virtual bool OnString(int id, const std::string& str) OVERRIDE;
 
+  bool live_mode_;
+
   int64 track_type_;
   int64 track_num_;
   int64 track_uid_;