rasterize_and_record_micro.polymer failing on 2 builders

Builders failed on: 
- Android Nexus5X Perf (2): 
  https://build.chromium.org/p/chromium.perf/builders/Android%20Nexus5X%20Perf%20%282%29
- Android Nexus5X WebView Perf (2): 
  https://build.chromium.org/p/chromium.perf/builders/Android%20Nexus5X%20WebView%20Perf%20%282%29


There doesn't seem to be a metric in dashboard associated with this failure, hence we cannot bisect to see what caused it.

The buildbot page shows the following for the failing step: """
rasterize_and_record_micro.polymer rasterize_and_record_micro.polymer
rasterize_and_record_micro.polymer

benchmark_duration: 6.2


failures:
http://www.polymer-project.org/components/paper-checkbox/demo.html
http://www.polymer-project.org/components/paper-toggle-button/demo.html

Device Affinity: 5"""