Bug 1047507. Add a comment about keeping the KnownUniformName enum in sync.

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extra : rebase_source : 2445dd306a2aa4c3447293d5da88f786c679ced4
Bug 1048916. Convert a bunch of layers from nsAutoPtr to UniquePtr. r=roc

This makes the ownership of LayerProperties more clear.

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extra : rebase_source : c0413670f63906f90f083c0d9aaa8f55cf1ce898