[Media] Add a finch trial param for background MediaSource videos

media/blink/webmediaplayer_params.cc

Index: media/blink/webmediaplayer_params.cc
diff --git a/media/blink/webmediaplayer_params.cc b/media/blink/webmediaplayer_params.cc
index a89f6936a16864a399a9f955ae9f3e32f1390f06..ce635b6cc34c8ff937ba8dfd154afa2e3ba21e6b 100644
--- a/media/blink/webmediaplayer_params.cc
+++ b/media/blink/webmediaplayer_params.cc
@@ -24,6 +24,7 @@ WebMediaPlayerParams::WebMediaPlayerParams(
     SurfaceManager* surface_manager,
     base::WeakPtr<MediaObserver> media_observer,
     base::TimeDelta max_keyframe_distance_to_disable_background_video,
+    base::TimeDelta max_keyframe_distance_to_disable_background_video_mse,
     bool enable_instant_source_buffer_gc,
     bool allow_suspend,
     bool embedded_media_experience_enabled)
@@ -40,6 +41,8 @@ WebMediaPlayerParams::WebMediaPlayerParams(
       media_observer_(media_observer),
       max_keyframe_distance_to_disable_background_video_(
           max_keyframe_distance_to_disable_background_video),
+      max_keyframe_distance_to_disable_background_video_mse_(
+          max_keyframe_distance_to_disable_background_video_mse),
       enable_instant_source_buffer_gc_(enable_instant_source_buffer_gc),
       allow_suspend_(allow_suspend),
       embedded_media_experience_enabled_(embedded_media_experience_enabled) {}