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also, add test cases.

Bug: 825684
Change-Id: I0ce0bbbd5b4c218042f934264ab4de288eba9dae
Reviewed-on: https://chromium-review.googlesource.com/997316Reviewed-by: Yoshifumi Inoue <yosin@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548692}