The caller is supposed to precompensate for memory that is wasted at the end of pages. This seems onerous, but it's the sort of thing the snapshot code already
needs to keep track of so it's not too bad.  I will update the comments
accordingly.

As for the large object space that is a little messy. In practice, a context snapshot won't contain many large objects and it may be OK to just fudge it by using an AlwaysAllocate scope around large object allocations. At least there
are no issues with non-contiguous allocation.

http://codereview.chromium.org/545026
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