smoothness.pathological_mobile_sites failing on chromium.perf/Android Nexus5 Perf (2)

Builders failed on: 
- Android Nexus5 Perf (2): 
  https://build.chromium.org/p/chromium.perf/builders/Android%20Nexus5%20Perf%20%282%29


It looks like a device is either dropping offline during a test, or a test is causing it to fail?

The suite fails semi flakily, and the test which fails in the suite isn't always reliable.

https://uberchromegw.corp.google.com/i/chromium.perf/builders/Android%20Nexus5%20Perf%20%282%29/builds/4969 -> pbs
https://uberchromegw.corp.google.com/i/chromium.perf/builders/Android%20Nexus5%20Perf%20%282%29/builds/4968 -> wow
https://uberchromegw.corp.google.com/i/chromium.perf/builders/Android%20Nexus5%20Perf%20%282%29/builds/4969 -> pbs
https://uberchromegw.corp.google.com/i/chromium.perf/builders/Android%20Nexus5%20Perf%20%282%29/builds/4966 -> yahoo sports

https://uberchromegw.corp.google.com/i/chromium.perf/builders/Android%20Nexus5%20Perf%20%282%29/builds/4963 has a device drop offline. So maybe they're just flaky?? :(