CHOP-753: Introduce a sliding window of framerate samples.

The trouble with remembering the slowest-ever framerate is that framerate
drops dramatically on login, then typically bounces back to something
reasonable during the session. So the session-normal framerate has to drop
pretty dramatically before it falls below the original login framerate. To
address this, only remember the last ~10 minutes of framerates, and log memory
stats every time a new framerate is slower than the previous 10 minutes.

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