Every macOS/iOS MediaPlayerPrivate contains identical code for handling fullscreen. Make VideoFullscreenLayerManager an abstract class, add an ObjC version, and put the shared code there.
<rdar://problem/38715419>
Created attachment 336230 [details] Patch
Comment on attachment 336230 [details] Patch Clearing flags on attachment: 336230 Committed r229824: <https://trac.webkit.org/changeset/229824>
All reviewed patches have been landed. Closing bug.