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This will allow use of these constants in constexpr expressions.

Change-Id: Ia2d6f8ab6969eedbc9b9b763f7f700ffaaaee14b
Reviewed-on: https://chromium-review.googlesource.com/1219769Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590419}