Declare KEYCODE_SLEEP and KEYCODE_WAKEUP.

These new keys behave in similarly to KEYCODE_POWER but do not
simply toggle between awake and asleep states.

Sleep puts the device to sleep if it is awake.
Wakeup wakes up the device if it is asleep.

Bug: 12938999
Change-Id: I260fb918cc858882fe06fa880910df5763a76c5d
5 files changed