All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=648982

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg-Z_toQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICghcG_rQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgheaQpQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICghdiMpwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICgheC2lwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg-ZvRrAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICghdiMpwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICghcGGqQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICghZu7vwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICghcbBqgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICghYPvsQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICghb36oQkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgICg-cTE_wsM


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

webrtc-linux-large-tests

Wow, I wonder where all those improvements came from though.
Roll CL: https://chromium.googlesource.com/external/webrtc/+/519da00bb3911c8812af7bd76d84c9511778e8fb

peah: anything you see that could explain it. Either way I guess we'll just be happy.

Added some more improvement alerts from the level_controller.