Merge "Move shared methods and constants from Proxy to shared lib" am: 933b49f9b1 am: e532759305 am: 7a0e843c2c

Original change: https://android-review.googlesource.com/c/platform/frameworks/libs/net/+/1576988

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I8d5d1f74efec1957a990dd17b066917ca1bcdb91