DoH statistics is now available from DnsStats and is shown in dumpsys dnsresolver.

Example of output from dumpsys dnsresolver:

  Server statistics: (total, RTT avg, {rcode:counts}, last update)
    over UDP
      8.8.4.4 (3, 2503ms, [TIMEOUT:3 ], 465s) score{71.0}
      8.8.8.8 (4, 1880ms, [NOERROR:1 TIMEOUT:3 ], 468s) score{77.3}
      2001:4860:4860::8844 (9, 15ms, [NOERROR:9 ], 78s) score{99.8}
      2001:4860:4860::8888 <no data> score{100.0}
    over DOH
      2001:4860:4860::8888 (89, 30ms, [NOERROR:89 ], 127s) score{99.7}
    over TLS
      8.8.4.4 <no data> score{100.0}
      8.8.8.8 <no data> score{100.0}
      2001:4860:4860::8844 <no data> score{100.0}
      2001:4860:4860::8888 <no data> score{100.0}
    over TCP
      8.8.4.4 <no data> score{100.0}
      8.8.8.8 <no data> score{100.0}
      2001:4860:4860::8844 <no data> score{100.0}
      2001:4860:4860::8888 <no data> score{100.0}
    over MDNS
      224.0.0.251 <no data> score{100.0}
      ff02::fb <no data> score{100.0}
  TC mode: default
  TransportType: WIFI

Test steps:
a. Default enable strict mode.
b. Turn on WiFi.
c. Turn on Mobile data.
d. Check the output from dumpsys dnsresolver.
e. Expect to see two different statistics with the same DNS server on different NetId.

NetId: 101
    over DOH
      2001:4860:4860::8888 (90, 29ms, [NOERROR:90 ], 7s) score{99.7}
  TransportType: WIFI

NetId: 102
    over DOH
      2001:4860:4860::8888 (2, 33ms, [NOERROR:2 ], 74s) score{99.7}
  TransportType: CELLULAR

Bug: 195092631
Test: checked output in dumpsys dnsresolver
Change-Id: I65c69a850bce352839314833d44c9f165c7ca142