Add API for proxy configuration over VPN.

Test: runtest -x
frameworks/base/tests/net/java/com/android/server/ConnectivityServiceTest.java
&& atest HostsideVpnTests
Bug: 76001058
Change-Id: Id4dde4a4103fd93bfbbacc52d0e5ade56ae67a6a
Merged-In: Id4dde4a4103fd93bfbbacc52d0e5ade56ae67a6a
4 files changed
tree: d647a94cad8aef555c5baa45081c6d959af69c10
  1. core/
  2. services/
  3. tests/