Android: further "user build" perf test automation.

Android: further "user build" perf test automation.

Use "cat /dev/null" rather than "echo".
"echo" is not guaranteed to be in the path or the system image.
"cat" seems available on the images used by the bots.

BUG=175127
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=182261

[Sami, 2013-02-13 11:05:34]

lgtm.

https://codereview.chromium.org/12230008/diff/1/build/android/pylib/android_c...
File build/android/pylib/android_commands.py (right):

https://codereview.chromium.org/12230008/diff/1/build/android/pylib/android_c...
build/android/pylib/android_commands.py:732: return self.RunShellCommand('su -c
cat /dev/null') == ['']
This could be slightly more reliable if we tried to cat a file that was only
readable by root (e.g., /proc/kmsg). But let's not make this any more complex
than it needs to be :)

[bulach, 2013-02-13 11:08:56]

thanks sami! CQing..

https://codereview.chromium.org/12230008/diff/1/build/android/pylib/android_c...
File build/android/pylib/android_commands.py (right):

https://codereview.chromium.org/12230008/diff/1/build/android/pylib/android_c...
build/android/pylib/android_commands.py:732: return self.RunShellCommand('su -c
cat /dev/null') == ['']
On 2013/02/13 11:05:34, Sami wrote:
> This could be slightly more reliable if we tried to cat a file that was only
> readable by root (e.g., /proc/kmsg). But let's not make this any more complex
> than it needs to be :)

:)

[commit-bot: I haz the power, 2013-02-13 11:09:54]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/bulach@chromium.org/12230008/1

[commit-bot: I haz the power, 2013-02-13 11:30:37]

Retried try job too often on linux_chromeos for step(s) aura_unittests,
ppapi_unittests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_chro...

[commit-bot: I haz the power, 2013-02-13 11:55:54]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/bulach@chromium.org/12230008/1

[commit-bot: I haz the power, 2013-02-13 18:29:29]

Change committed as 182261