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Take seed generation logic from base's address_space_randomization.cc.
One small tweak is to avoid the bottom three bits of a stack address and
invert, to make leaking ASLR more difficult along the lines of the
freelist masking in base's partition allocator. Another tweak is to
mix in some more time-based information. Another tweak is to add in
the times called so that rapid successive calls return different results.
Bug: pdfium:891
Change-Id: I14238da15cee9c8d4ca72d79e4f7fbb26997c619
Reviewed-on: https://pdfium-review.googlesource.com/13490
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
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