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These wrap the process_vm_writev() and process_vm_readv() syscalls
which write to another process's memory (as long the caller has ptrace
privileges for the target process). This is necessary for the
USER_NOTIF broker to read syscall params and write to syscall outparams.

Bug: 1117351
Change-Id: I5b85884eb7f7545598affe91f3e4ec4cb6a569b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2407010Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Matthew Denton <mpdenton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810865}