Caches and memory pressure observers

[Boris Zbarsky]

I was just thinking that there are all sorts of places in layout where 
we cache things.... The CSSLoader has some caches (of sheets, 
CSSParsers, etc).  The frame manager has a primary frame map.  The 
ruletree may have stale nodes because it only gcs periodically...

All of these should probably listen for memory pressure notifications 
and flush out as much data as possible when they happen.  Are there any 
other such places?

-Boris
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