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Problem is the same, but didn't get the sort key exactly right.

This also adds a test for idempotency (but our test data is too trivial to catch
this bug).

Bug: 779895
Change-Id: I3021ec2cf222c27b51cfaba1b90bd3b7ed1f912f
Reviewed-on: https://chromium-review.googlesource.com/748809
Commit-Queue: Samuel Huang <huangs@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#513232}