All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=615025

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgrI2zsgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg7KyJogoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg7OjDvQkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgrPWivwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgrP2suQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg7ID5rwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg7IrOuQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgrLXvtwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgrJPNvQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg7I7UqgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgrJKU4AkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg7JiIswoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgrLWLpgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgrJOxrAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgrJOmtQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg7KzYtQoM


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

webrtc-android-tests-nexus5
webrtc-android-tests-nexus72

Looks like an improvement, I have no idea if it's expected, but it's probably not worth investigating.