[Media] Plumb a feature parameter for the background video keyframe distance.

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 2131 matching lines @@
   // Don't change video track while the pipeline is resuming or seeking.
   if (is_pipeline_resuming_ || seeking_)
     return;
 
   if (!video_track_disabled_ && ShouldDisableVideoWhenHidden()) {
     video_track_disabled_ = true;
     selectedVideoTrackChanged(nullptr);
   }
 }
 
+void WebMediaPlayerImpl::SetMaxKeyframeDistanceToDisableBackgroundVideo(
+    base::TimeDelta distance) {
+  max_keyframe_distance_to_disable_background_video_ = distance;
+}
+
 void WebMediaPlayerImpl::SetPipelineStatisticsForTest(
     const PipelineStatistics& stats) {
   pipeline_statistics_for_test_ = base::make_optional(stats);
 }
 
 PipelineStatistics WebMediaPlayerImpl::GetPipelineStatistics() const {
   DCHECK(main_task_runner_->BelongsToCurrentThread());
 
   return pipeline_statistics_for_test_.value_or(pipeline_.GetStatistics());
 }
 
 }  // namespace media