tree d449c8e61ad9f60b6f9a9bb5bb56c9f8e9d2509f
parent c5a03a68d9b230eb8d68ff8566e0079907ba9da4
author Chiachang Wang <chiachangwang@google.com> 1543312805 +0800
committer Chiachang Wang <chiachangwang@google.com> 1543312805 +0800

Data stall detection using DNS event

If dns resolver on a network get consecutively timeout then it
is a strong signal that the network is no longer usable.
Reevaluate the network once it's data stall suspected

Test: 1. runtest frameworks-net
      2. SettingsBackupTest passes
      2. Run on wifi w/o internet capability
Bug: 112653893, 113916551

Change-Id: I74287b174d933f97a91fa1529b1809856ac3b38d