Support for parsing nexus 5(4.4) process list result.

`$ adb shell ps` result on others
```
USER     PID   PPID  VSIZE  RSS     WCHAN    PC         NAME
radio     1396  244   325048 30552 ffffffff 4022e7fc S com.android.phone
```

on nexus 5 (4.4)
```
PID USER       VSZ STAT COMMAND
144 0            0 SW<  [ext4-dio-unwrit]
```