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Adds an UMA metric that tracks the effective resolution of the primary
display. To ensure the metric being measured is one that the user is to
spends most time on, the signal is sent at every fixed interval of
30 minutes.

Effective resolution takes into account the display zoom, device scale
factor, and the display rotation.

Bug: 1126489
Test: Tested manually on atlas and krane
Change-Id: Id0f92867c6927f06f0c5c2288198f5bff3a5b8b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412837Reviewed-by: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Auto-Submit: Malay Keshav <malaykeshav@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814037}