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SetDisplayPower() is called by powerd to turn the panel on. After that
powerd will set the backlight level. Since DisplayConfigurator may be
executing the SetDisplayPower() operation asynchronously, the panel
may still be off when powerd tries to set the backlight level. So
powerd's operation would be ignored by the driver.

BUG=chrome-os-partner:35662

Review URL: https://codereview.chromium.org/886103002

Cr-Commit-Position: refs/heads/master@{#313983}