Stop assuming metadata contains at least one stream

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 2285 matching lines @@
   if (IsRemote())
     return;
 #endif
 
   // Idle timeout chosen arbitrarily.
   background_pause_timer_.Start(FROM_HERE, base::TimeDelta::FromSeconds(5),
                                 this, &WebMediaPlayerImpl::OnPause);
 }
 
 void WebMediaPlayerImpl::CreateWatchTimeReporter() {
+  if (!HasVideo() && !HasAudio())
+    return;
+
   // Create the watch time reporter and synchronize its initial state.
   watch_time_reporter_.reset(
       new WatchTimeReporter(HasAudio(), HasVideo(), !!chunk_demuxer_,
                             is_encrypted_, embedded_media_experience_enabled_,
                             media_log_.get(), pipeline_metadata_.natural_size,
                             base::Bind(&GetCurrentTimeInternal, this)));
   watch_time_reporter_->OnVolumeChange(volume_);
   if (delegate_->IsFrameHidden())
     watch_time_reporter_->OnHidden();
   else
@@ skipping 231 matching lines @@
 }
 
 #undef UMA_HISTOGRAM_VIDEO_HEIGHT
 
 void WebMediaPlayerImpl::SetTickClockForTest(base::TickClock* tick_clock) {
   tick_clock_.reset(tick_clock);
   buffered_data_source_host_.SetTickClockForTest(tick_clock);
 }
 
 }  // namespace media