All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=626563

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0rLhugkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0q-DuQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0v3ErgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0q_ZqAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0rK1pwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgsrT6owoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0sXmpQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0qbH5ggM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0oPvqwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgsujRsAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0uXRqAkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0tve5goM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgsvCitAkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0tve5ggM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0vD8rgsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0vKZqAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0vKOsQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0o-jrQkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgkq_H9gkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0u-6vQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgkq_H9goM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0vaAvQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0syt_QgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgsrThsgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0vLSoAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0v2OoQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0rL6qwsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0u_srAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0q2Y9wgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0uvloAsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0vLEvgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0u_wtQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0rL6qwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0sXxtAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgsojTvgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0uvloAkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0tuTrgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0t-vowoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0oOVowoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg0ubl8AoM


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

webrtc-linux-large-tests
webrtc-mac-large-tests

Triggered around the Chromium roll in https://codereview.webrtc.org/2119423002, which included a libvpx roll: https://chromium.googlesource.com/webm/libvpx.git/+log/243029faff..1c0a9f36f1