Add isCellularDataAvailable() in WifiDataStall

Add isCellularDataAvailable() in WifiDataStall to help connection
duration collection

Bug: 144585569
Test: atest com.android.server.wifi
Change-Id: I93dc5aa66af96dc0161ebc31cce912a13c5b940f
5 files changed
tree: 69bd35311c2502fa568b5e456133d09b6ca2b7be
  1. apex/
  2. service/
  3. PREUPLOAD.cfg