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The base::debug::Alias function is normally used to 'fool' the compiler
into retaining an otherwise discardable local variable. In this case
base::debug::Alias is used in a completely different way which initially
seems wrong, but is actually reasonable. A comment will avoid confusion
when auditing uses of Alias.

The initial discussion of using base::debug::Alias is here:
https://codereview.chromium.org/2810833002#msg7

Bug: 756589
Change-Id: Ib00a1444c217680a69178a8bbf6c710179126e86
Reviewed-on: https://chromium-review.googlesource.com/794298Reviewed-by: Brett Wilson <brettw@chromium.org>
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519860}