init AndroidCommand after the device online to root it

init AndroidCommand after the device online to root it

AndroidCommand object will root the device when it is created. 
If this happened before the device is online, error will appear.

BUG=
TEST=


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=146306

[Wei James(wistoch), 2012-07-12 05:16:15]

# 07/12/12 13:16:15: Unrecognized output from adb root: error: device not found

[bulach, 2012-07-12 07:33:38]

lgtm, thanks!

http://codereview.chromium.org/10695170/diff/1/build/android/emulator.py
File build/android/emulator.py (right):

http://codereview.chromium.org/10695170/diff/1/build/android/emulator.py#newc...
build/android/emulator.py:224: a.Adb().SetTargetSerial(self.device)
nit: 224 is no longer necessary..

[Wei James(wistoch), 2012-07-12 07:39:49]

http://codereview.chromium.org/10695170/diff/1/build/android/emulator.py
File build/android/emulator.py (right):

http://codereview.chromium.org/10695170/diff/1/build/android/emulator.py#newc...
build/android/emulator.py:224: a.Adb().SetTargetSerial(self.device)
On 2012/07/12 07:33:38, bulach wrote:
> nit: 224 is no longer necessary..

fixed. thanks

[bulach, 2012-07-12 08:09:51]

lgtm, thanks!

[Wei James(wistoch), 2012-07-12 08:11:13]

On 2012/07/12 08:09:51, bulach wrote:
> lgtm, thanks!

thanks.

[commit-bot: I haz the power, 2012-07-12 08:11:25]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/james.wei@intel.com/10695170/4001

[commit-bot: I haz the power, 2012-07-12 09:20:31]

Change committed as 146306