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This CL migrates ArcPowerBridge.

BUG=672829
TEST=Ran try.

Change-Id: I02dac942cbd31635120c62734032ca7611edae4b
Reviewed-on: https://chromium-review.googlesource.com/572881
Commit-Queue: Hidehiko Abe <hidehiko@chromium.org>
Reviewed-by: Yusuke Sato (in China Mon-Thurs, may be offline) <yusukes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487013}