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This change introduces base::CheckedContiguousRange, which similarly to
base::span is a light-weight wrapper around a contiguous container
performing bound CHECKs.

However, in contrast to base::span this class keeps a pointer to the
underlying container, and thus is able to respond to changes to data()
and size(), which base::span can't do.

Furthermore, this change provides a constexpr overload of base::data()
for std::array and fixes a bug in CheckedContiguousIterator::operator-=.

Bug: 990059

Change-Id: I3fef91c7ef7874bf495ac2ab6dbaf3a8b02dab35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893858
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Chris Palmer <palmer@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712120}