[Media] Added feature flag for new remote playback pipeline

content/public/common/web_preferences.h

Index: content/public/common/web_preferences.h
diff --git a/content/public/common/web_preferences.h b/content/public/common/web_preferences.h
index ae9756cf9e1654f88697d4fb99641c7e6423b8bb..1aaff5da8c56e2383276e1fc69b4261a1462be71 100644
--- a/content/public/common/web_preferences.h
+++ b/content/public/common/web_preferences.h
@@ -266,6 +266,9 @@ struct CONTENT_EXPORT WebPreferences {
   // If enabled, disabled video track when the video is in the background.
   bool background_video_track_optimization_enabled;
 
+  // If enabled, use the new remote playback pipeline.
+  bool new_remote_playback_pipeline_enabled;
+
   // When memory pressure based garbage collection is enabled for MSE, the
   // |enable_instant_source_buffer_gc| flag controls whether the GC is done
   // immediately on memory pressure notification or during the next SourceBuffer