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We plan to deprecate kUnspecedTimer / kUnspecedLoading / kUnthrottled
and introduce kInternal* for internal usages.

This CL introduces kInternalTest for tests or mock objects and replaces
the current task types with kInternalTest.

Doc: https://docs.google.com/document/d/1n9qNbP0H28J4DIzorydemc36b1xy-8-5zEADsoJfMxU/edit#

Bug: 794123
Change-Id: If4e616d9b770ff0e5be88261e68c3fd572d05783
Reviewed-on: https://chromium-review.googlesource.com/822792
Commit-Queue: Hajime Hoshi <hajimehoshi@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524024}