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Current sort order is by modification time, which means mixed photos
and videos from the camera app always "get older" when pressing right.
However, feedback suggests this is confusing when opening the gallery
from the files app.

Sorting by name instead is more likely to match the sorting field
in the files app, and consistent with what the old gallery app did. The
order defaults to reverse-lexicographic so that pressing "right" still
goes to older files from the camera app.

Bug: b/169012791
Change-Id: I2240ca022519a52f04cd5c1ca1f42f29d014a6ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419099
Commit-Queue: Trent Apted <tapted@chromium.org>
Reviewed-by: Patti <patricialor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808783}