[Android] With gyp_managed_install no device is only a warning

[Android] With gyp_managed_install no device is only a warning

Before running any action that interacts with the device, check that 
one is actually attached. If not, print a big warning and skip the action.

BUG=235521
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=199263

[newt (away), 2013-04-29 21:23:56]

lgtm with one question

https://codereview.chromium.org/13877025/diff/5001/build/android/gyp/util/bui...
File build/android/gyp/util/build_utils.py (right):

https://codereview.chromium.org/13877025/diff/5001/build/android/gyp/util/bui...
build/android/gyp/util/build_utils.py:135: device_state = CheckCallDie(['adb',
'get-state'], suppress_output=True)
what happens if multiple devices are attached?

[cjhopman, 2013-04-30 00:32:15]

https://codereview.chromium.org/13877025/diff/5001/build/android/gyp/util/bui...
File build/android/gyp/util/build_utils.py (right):

https://codereview.chromium.org/13877025/diff/5001/build/android/gyp/util/bui...
build/android/gyp/util/build_utils.py:135: device_state = CheckCallDie(['adb',
'get-state'], suppress_output=True)
On 2013/04/29 21:23:57, newt wrote:
> what happens if multiple devices are attached?
adb get-state returns "unknown" with multiple devices attached so this will
return false.

This is sort of what we want, since all the steps will fail when there are
multiple devices attached. So in that case the build will now succeed, but the
warning message might be a bit(/a lot) confusing.

[newt (away), 2013-04-30 00:34:42]

https://codereview.chromium.org/13877025/diff/5001/build/android/gyp/push_lib...
File build/android/gyp/push_libraries.py (right):

https://codereview.chromium.org/13877025/diff/5001/build/android/gyp/push_lib...
build/android/gyp/push_libraries.py:53: 'No device attached. Skipping native
library push.')
how about

"Zero (or multiple) devices attached. Skipping..."

[commit-bot: I haz the power, 2013-05-09 20:13:09]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/cjhopman@chromium.org/13877025/13001

[commit-bot: I haz the power, 2013-05-09 20:24:26]

Change committed as 199263