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Accessibility metrics are fired once, 45 seconds after startup.
However, UMA counts unique users on a daily basis.

This means that the metrics system is only counting 1/2 of users who don't
relaunch their browser in a 2 day period. Or 1/3 of users who don't
relaunch for 3 days, etc.

Adding the following *.EveryReport alternate histogram names for
histograms that fire more often. These can be used with the unique
users aggregation option when viewing metrics:
Accessibility.CrosSpokenFeedback.EveryReport
Accessibility.Android.ScreenReader.EveryReport,
Accessibility.Mac.ScreenReader.EveryReport,
Accessibility.WinScreenReader2.EveryReport,
Accessibility.WinJAWS.EveryReport
Accessibility.WinNVDA.EveryReport
Accessibility.WinZoomText.EveryReport

Bug: 988502
Change-Id: I0b29dc35615668aafb7e873e574c1ba7ae280ead
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1724698
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682971}