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This patch also add a constructor to make unit test easy.

Bug: 1064420
Change-Id: Ibeaa4bdab2c66f581360eea1a37e199b2c009313
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2140920
Commit-Queue: Tao Bai <michaelbai@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758225}