Reset underflow count upon seek event.

media/blink/webmediaplayer_impl.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/blink/webmediaplayer_impl.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 #include <string>
@@ skipping 971 matching lines @@
     }
 #else
     paused_time_ = pipeline_.GetMediaTime();
 #endif
   } else {
     DCHECK(watch_time_reporter_);
     watch_time_reporter_->OnPlaying();
   }
   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() {
 #if defined(OS_ANDROID)
   if (isRemote()) {
     scoped_refptr<VideoFrame> frame = cast_impl_.GetCastingBanner();
     if (frame)
       compositor_->PaintSingleFrame(frame);
   }
 #endif
@@ skipping 808 matching lines @@
       pipeline_metadata_.natural_size,
       base::Bind(&GetCurrentTimeInternal, this)));
   watch_time_reporter_->OnVolumeChange(volume_);
   if (delegate_ && delegate_->IsHidden())
     watch_time_reporter_->OnHidden();
   else
     watch_time_reporter_->OnShown();
 }
 
 }  // namespace media