Jeff Muizelaar d20849c5bf Bug 1044241. Discard tile back buffers that haven't been recently used. r=nical
Tracks tiles that have a back buffer with a nsExpirationTracker and discards
them after a while. This should help us claim back tile memory for tiles
that have stopped changing.

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extra : rebase_source : 2528de0a6fac08cb6f97ebd946d9f72a63b7d2b1
2014-07-31 23:25:37 -04:00
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