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This change provides C++14 implementations of C++17's std::size(),
std::empty() and std::data().

Bug: 828324
Change-Id: If1b83826a23b26fd557f7854962bcbc771a7ffe0
Reviewed-on: https://chromium-review.googlesource.com/992236
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550137}