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This is useful in debugging to attribute what a window is.

BUG=none
TEST=none

Change-Id: If996333847d83c5102ddd81e4ecff25691c09eca
Reviewed-on: https://chromium-review.googlesource.com/c/1351099
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611031}