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Note that we have our own dashboards outside of uma.googleplex.com so
some automatic rollovers of histograms are not happening.

This change also moves the TextToSpeech histograms to the accessibility/
subdirectory from other/, as we're the same team that owns those.

Bug: 1153776, 1153775, 1153725, 1153724, 1153722, 1153717, 1153719
Change-Id: I24c2d313a63457060f5513a365eda41c5ef27240
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2605566
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840790}