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This change implements constructors for base::span that allow the
construction from a pair of pointers, std::arrays and containers
supporting base::data and base::size, e.g. std::initializer_list.
In addition, this change adds operator().

Bug: 788913
Change-Id: Ibc280eef1c7e47a5a27e92503dda3614ef5513a4
Reviewed-on: https://chromium-review.googlesource.com/981139Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551313}