Jeff Muizelaar 9c783e8ed0 Bug 1136242. Make sure we acquire the mutexes when copying the surfaces. r=jgilbert
This was causing badness when using preserveDrawingBuffers = true

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extra : rebase_source : 96338c4ef8ef3afd9541bde3158b915b8e62551f
2015-02-27 14:17:55 -05:00
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