Don't pause suspended videos with no audio.

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 2087 matching lines @@
                             data_source_memory_usage / 1024);
   }
   if (demuxer_) {
     UMA_HISTOGRAM_MEMORY_KB("Media.WebMediaPlayerImpl.Memory.Demuxer",
                             demuxer_memory_usage / 1024);
   }
 }
 
 void WebMediaPlayerImpl::ScheduleIdlePauseTimer() {
   // Only schedule the pause timer if we're not paused or paused but going to
-  // resume when foregrounded, and are suspended.
-  if ((paused_ && !paused_when_hidden_) || !pipeline_controller_.IsSuspended())
+  // resume when foregrounded, and are suspended and have audio.
+  if ((paused_ && !paused_when_hidden_) ||
+      !pipeline_controller_.IsSuspended() || !hasAudio()) {
     return;
+  }
 
 #if defined(OS_ANDROID)
   // Remote players will be suspended and locally paused.
   if (isRemote())
     return;
 #endif
 
   // Idle timeout chosen arbitrarily.
   background_pause_timer_.Start(FROM_HERE, base::TimeDelta::FromSeconds(5),
                                 this, &WebMediaPlayerImpl::OnPause);
@@ skipping 194 matching lines @@
 
 void WebMediaPlayerImpl::RecordUnderflowDuration(base::TimeDelta duration) {
   DCHECK(data_source_ || chunk_demuxer_);
   if (data_source_)
     UMA_HISTOGRAM_TIMES("Media.UnderflowDuration", duration);
   else
     UMA_HISTOGRAM_TIMES("Media.UnderflowDuration.MSE", duration);
 }
 
 }  // namespace media