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The pagemap is a file in procfs for each process. It contains
information on every page mapped into that processes virtual
address space. This CL adds a pagemap parser as we will need
one for future CrOS projects, specifically userspace swap.

Bug: 1067833
Change-Id: I31aafcebd5894899f13748d6a3f13f9f1edf375d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2138771
Commit-Queue: Brian Geffon <bgeffon@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757199}