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Test coverage is also added.

Bug: 734095
Change-Id: Id0fa36d078aa68ccbe4d2b820d55838303bbfdd9
Reviewed-on: https://chromium-review.googlesource.com/896743Reviewed-by: Greg Thompson <grt@chromium.org>
Commit-Queue: Xi Cheng <chengx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537797}