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This CL adds a content description to the "Details" TextView header
over the Data Usage Breakdown table. This content description describes
what the current sorting scheme to users using TalkBack.

Bug: 849395
Change-Id: I8328a5a41a37a55a532c5955777200df73a44f53
Reviewed-on: https://chromium-review.googlesource.com/1090072Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565699}