Update duration when demuxed packets exceed known duration.

content/renderer/media/render_media_log.h

Index: content/renderer/media/render_media_log.h
diff --git a/content/renderer/media/render_media_log.h b/content/renderer/media/render_media_log.h
index e9b655aed4b85e360750c6ea6f850a9268265e4a..ed9ce629889c0b1d2c5eb53eb77f4db4d4fdcf8a 100644
--- a/content/renderer/media/render_media_log.h
+++ b/content/renderer/media/render_media_log.h
@@ -69,8 +69,9 @@ class CONTENT_EXPORT RenderMediaLog : public media::MediaLog {
   // For enforcing max 1 pending send.
   bool ipc_send_pending_;
 
-  // Limits the number buffered extents changed events we send over IPC to one.
+  // Limits the number of events we send over IPC to one.
   std::unique_ptr<media::MediaLogEvent> last_buffered_extents_changed_event_;
+  std::unique_ptr<media::MediaLogEvent> last_duration_changed_event_;
 
   // Holds a copy of the most recent MEDIA_ERROR_LOG_ENTRY, if any.
   std::unique_ptr<media::MediaLogEvent> last_media_error_log_entry_;