All graphs for this bug:
  https://chromeperf.appspot.com/group_report?bug_id=604431

Original alerts at time of bug-filing:
  https://chromeperf.appspot.com/group_report?keys=agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA-4eypgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA-_K6rgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDAh5ymtwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDAh4ziqQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA--3osQsM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA-72ZowoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA-4iNtQkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDAh9CstAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA-7fmpQoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA-97PmAgM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA-_OysAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDAu53nrAoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA-62TvgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA-_6KuwkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA-9mVswkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDAu7OsuQkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA--CVpAkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDAu5forwoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA-5y_qgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA-_WpqgoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA-_W2swoM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA-4n3qgkM,agxzfmNocm9tZXBlcmZyFAsSB0Fub21hbHkYgIDA-5z1ogoM


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

chromium-rel-mac-hdd
chromium-rel-mac-retina
chromium-rel-mac10
chromium-rel-mac11
chromium-rel-win10
chromium-rel-win7-dual
chromium-rel-win7-gpu-ati
chromium-rel-win7-gpu-intel
chromium-rel-win7-gpu-nvidia
chromium-rel-win7-single
chromium-rel-win7-x64-dual
chromium-rel-win8-dual
win-zenbook

This was expected for large blob sizes. We can work on fixing this by increasing our shared memory block count & size.