Merge "RpcServer: expose server fd" am: e81f29d204 am: fbbcccc723 am: 8eba788850 am: 8c68daf647

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1705663

Change-Id: I8074e3d3f6269d6e82710b4ed81ea41f0e022c82