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After deduplicating 100 filenames,
i.e. foo.jpg, foo (1).jpg, ... foo (100).jpg, Chrome will stop trying.

On Desktop this is acceptable, as the user gets a prompt to choose
a filename.

On Android, this is really bad, because there is no prompt to choose
an alternate filename, and the download just silently fails.

This CL starts using a timestamp after 100, and creates filenames in
the ISO 8601 format, like: foo - 2018-10-11T21:55:47.392Z.jpg

Bug: 135428
Change-Id: I13748110171f799f58c8ddf27f22eebc97149c09
Reviewed-on: https://chromium-review.googlesource.com/c/1278137Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599802}