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This CL lands internal change 166256846 by wangyix.

BUG=488484

Change-Id: Idb25c187d402edc5e6c180c529fc3eede2c416bf
Reviewed-on: https://chromium-review.googlesource.com/620201
Commit-Queue: Yixin Wang <wangyix@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#510184}