Context: in but https://bugs.chromium.org/p/chromium/issues/detail?id=712471 we detected an increase in GPU memory in one of our tests. After examining the problem, it turns out that we were measuring memory after logging out and restarting chrome, and therefore detected an increase in login screen GPU memory usage.

The increase in memory consumption at the login screen can be seen in these graphs:
https://chromeperf.appspot.com/group_report?bug_id=712471

The test is now fixed to detect the proper GPU memory usage, but the GPU memory usage regression is still there, and this is what this bug is about.

Albert, I am assigning to you for triage.