Jungshik Jang b3ecb72af8 Use async polling for HPD action
Since Device polling holds whole IO thread while it's running,
other sending requests would be blocked until it's finished.
Usually polling takes more than 1 seconds and some action might
be timeouted.
This change sends polling message asynchrousely for
each device address.

Bug: 17381548

Change-Id: I2f47931c5882649d6ac56092986d34d1da48f710
2014-09-12 13:37:33 +09:00
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