All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=650044

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyuQELEhNTdG9wcGFnZUFsZXJ0UGFyZW50IooBQ2hyb21pdW1QZXJmL2FuZHJvaWQtbmV4dXM1L3Ntb290aG5lc3MudG91Z2hfZmlsdGVyc19jYXNlcy9mcmFtZV90aW1lcy9odHRwX19fbGV0bWVzcGVsbGl0b3V0Zm9yeW91LmNvbV9zYW1wbGVzX3N2Z19maWx0ZXJfdGVycmFpbi5zdmdfcmVmDAsSDVN0b3BwYWdlQWxlcnQY98MZDA,agxzfmNocm9tZXBlcmZyjwMLEhNTdG9wcGFnZUFsZXJ0UGFyZW50IuACQ2hyb21pdW1QZXJmL2FuZHJvaWQtbmV4dXM1L3Ntb290aG5lc3MudG91Z2hfZmlsdGVyc19jYXNlcy9mcmFtZV90aW1lcy9odHRwX19fcmF3Z2l0LmNvbV9XZWJLaXRfd2Via2l0X21hc3Rlcl9QZXJmb3JtYW5jZVRlc3RzX0FuaW1vbWV0ZXJfZGV2ZWxvcGVyLmh0bWw_dGVzdC1pbnRlcnZhbF8yMF9kaXNwbGF5X21pbmltYWxfY29udHJvbGxlcl9maXhlZF9mcmFtZS1yYXRlXzUwX2thbG1hbi1wcm9jZXNzLWVycm9yXzFfa2FsbWFuLW1lYXN1cmVtZW50LWVycm9yXzRfdGltZS1tZWFzdXJlbWVudF9wZXJmb3JtYW5jZV9zdWl0ZS1uYW1lX0FuaW1vbWV0ZXJfdGVzdC1uYW1lX0ZvY3VzX2NvbXBsZXhpdHlfMTAwX3JlZgwLEg1TdG9wcGFnZUFsZXJ0GPfDGQw,agxzfmNocm9tZXBlcmZyoQELEhNTdG9wcGFnZUFsZXJ0UGFyZW50InNDaHJvbWl1bVBlcmYvYW5kcm9pZC1uZXh1czUvc21vb3RobmVzcy50b3VnaF9maWx0ZXJzX2Nhc2VzL2ZyYW1lX3RpbWVzL2h0dHBfX19zdGF0aWMuYm9iZG8ubmV0X0FuYWxvZ19DbG9jay5zdmdfcmVmDAsSDVN0b3BwYWdlQWxlcnQY98MZDA,agxzfmNocm9tZXBlcmZy5gELEhNTdG9wcGFnZUFsZXJ0UGFyZW50IrcBQ2hyb21pdW1QZXJmL2FuZHJvaWQtbmV4dXM1L3Ntb290aG5lc3MudG91Z2hfZmlsdGVyc19jYXNlcy9mcmFtZV90aW1lcy9odHRwX19fd2ViLmFyY2hpdmUub3JnX3dlYl8yMDE1MDUwMjEzNTczMl9odHRwX19faWUubWljcm9zb2Z0LmNvbV90ZXN0ZHJpdmVfUGVyZm9ybWFuY2VfUGlyYXRlc19EZWZhdWx0Lmh0bWxfcmVmDAsSDVN0b3BwYWdlQWxlcnQY98MZDA,agxzfmNocm9tZXBlcmZyeAsSE1N0b3BwYWdlQWxlcnRQYXJlbnQiSkNocm9taXVtUGVyZi9hbmRyb2lkLW5leHVzNS9zbW9vdGhuZXNzLnRvdWdoX2ZpbHRlcnNfY2FzZXMvZnJhbWVfdGltZXMvcmVmDAsSDVN0b3BwYWdlQWxlcnQY98MZDA


Bot(s) for this bug's original alert(s):

android-nexus5

There is indeed a gap between 418295 on Sep 14 and 418296-420855 on Sep 25 for both the ref and test builds.
But this bot seems to have started started reporting this benchmark again, though slower than before the gap: once a day or so rather than several points per day.
It looks like android-nexus5 (1) and (2) are busted, but (3) is working:
https://luci-milo.appspot.com/buildbot/chromium.perf/Android%20Nexus5%20Perf%20%281%29/
https://luci-milo.appspot.com/buildbot/chromium.perf/Android%20Nexus5%20Perf%20%282%29/
https://luci-milo.appspot.com/buildbot/chromium.perf/Android%20Nexus5%20Perf%20%283%29/

 Issue 650042  has been merged into this issue.