Framework: Forward port Long press back to kill app

Original author: DaneshM

Change-Id: I54f4fb861897fe713cffa15422535c5091a0c095

Conflicts:

	core/res/res/values/symbols.xml
Framework: Bring Long press back kill app toast back

It is now supported thanks to pawitp commiting the context fix for
displaying framework toasts

Change-Id: I8ab1beb49fc3b61355de8bc207482e2f51ff3e2a