Add insufficient throughput duration when the default network is on wifi

Add a new field to log the insufficient wifi throughput duration while
the default network is on wifi.

Updated-PDD: TRUE
Test: atest com.android.service.wifi
Bug: 169105967
Change-Id: I8aaa6d95acdf916d8b169e948cc7672bb2f0d10d
3 files changed
tree: 3ed44c32c0e3a2f0d8e3b6f7f3b306e6daa57035
  1. apex/
  2. service/
  3. metrics_pdd_hook.py
  4. PREUPLOAD.cfg