Update duration when demuxed packets exceed known duration.

content/renderer/media/render_media_log.cc

Index: content/renderer/media/render_media_log.cc
diff --git a/content/renderer/media/render_media_log.cc b/content/renderer/media/render_media_log.cc
index 1b3eeb53c61cf476456ab0bace584891145ec45d..1169f685b5a81ec6885ef39e92a8cb96195c0301 100644
--- a/content/renderer/media/render_media_log.cc
+++ b/content/renderer/media/render_media_log.cc
@@ -72,6 +72,12 @@ void RenderMediaLog::AddEvent(std::unique_ptr<media::MediaLogEvent> event) {
         // kind, if any, prior to sending the event batch.
         break;
 
+      case media::MediaLogEvent::DURATION_SET:
+        // Similar to the extents changed message, this may fire many times for
+        // badly muxed media. Suppress within our rate limits here.
+        last_duration_changed_event_.swap(event);
+        break;
+
       // Hold onto the most recent PIPELINE_ERROR and MEDIA_LOG_ERROR_ENTRY for
       // use in GetLastErrorMessage().
       case media::MediaLogEvent::PIPELINE_ERROR:
@@ -153,6 +159,11 @@ void RenderMediaLog::SendQueuedMediaEvents() {
       last_buffered_extents_changed_event_.reset();
     }
 
+    if (last_duration_changed_event_) {
+      queued_media_events_.push_back(*last_duration_changed_event_);
+      last_duration_changed_event_.reset();
+    }
+
     queued_media_events_.swap(events_to_send);
     last_ipc_send_time_ = tick_clock_->NowTicks();
   }