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Now we expose the initial time shown in the date time picker and read
the previous scheduled start time and show them in the date time
picker when the user press the change button in download home or
info bar.

Bug: 1110541
Change-Id: I7c562c6b3f3bcee0cb295d3b28b5830f82271b14
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2325075Reviewed-by: Hesen Zhang <hesen@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794645}