Merge "Add new APIs writeToByteBuffer/writeToBytes for generic Struct class." am: 761fe627e7 am: 87a3c0c13d

Original change: https://android-review.googlesource.com/c/platform/frameworks/libs/net/+/1471543

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ib14201e213f3465124e274ae6fc5c1fba740c309