Reset underflow count upon seek event.

media/blink/webmediaplayer_impl.cc

Index: media/blink/webmediaplayer_impl.cc
diff --git a/media/blink/webmediaplayer_impl.cc b/media/blink/webmediaplayer_impl.cc
index e45cd648575e075f2ac993ac0199e9ca82227a3d..4fa8e7663fe67b9d25766a397a0710458ec13b83 100644
--- a/media/blink/webmediaplayer_impl.cc
+++ b/media/blink/webmediaplayer_impl.cc
@@ -989,6 +989,10 @@ void WebMediaPlayerImpl::OnPipelineSeeked(bool time_updated) {
   }
   if (time_updated)
     should_notify_time_changed_ = true;
+
+  // Reset underflow count upon seek; this prevents looping videos and user
+  // actions from artificially inflating the underflow count.
+  underflow_count_ = 0;
 }
 
 void WebMediaPlayerImpl::OnPipelineSuspended() {