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These metrics will record the number of occluded/visible/hidden native Chrome windows on Windows. This information will be polled and computed on a repeating timer. This information will be used to determine if occlusion tracking on Windows is worth pursuing going forward.

Bug: 813093
Change-Id: Icc9d18ddd6ef293aca15a787b3fc5c1d64b4a4cd
Reviewed-on: https://chromium-review.googlesource.com/1025074
Commit-Queue: Varun Mohan <varunmohan@google.com>
Reviewed-by: Sébastien Marchand <sebmarchand@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554213}