Fix pointer index out of range exception

Avoid pointer index out of range error if return value is -1 of
findPointerIndex() when there is no data available for that pointer
identifier.

Change-Id: I2a08f04c678164e220852094baa124ba157e2e42
Signed-off-by: tingna_sung <tingna_sung@htc.com>
Reset killedByAm flag at attachApplicationLocked

ActivityManager reuses a process record object that killed
by him under some situation. That reused process record inherits
a killedByAm flag unexpectedly.
The killedByAm flag must be reset otherwise ActivityManager can't
judge the process can be killed or not.

Change-Id: If95137d91939cc44882ad2813131bcde0edd0c1b
Prevent showing immersive confirmation unexpectedly

By design, if the user presses the power key twice within 5 seconds
(panic), it will show immersive confirmation again at the next time
entering immersive mode.

But there is a bug on calculating the time between pressing the power
key. The time get from event.getDownTime() will stop when the device
is sleeping without being charged.

So here uses SystemClock.elapsedRealtime() instead.

https://code.google.com/p/android/issues/detail?id=80772

Change-Id: I4dca9dc260904f1c5b60464834781e2a82a9bcf4

Conflicts:

	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java