Moves constants from Intent to KeyguardManager. Fixes bug 17006280 Change-Id: I8ee1f534816a3fe823ad44479e227ba6d3675389
Adds an activity that prompts the user for their PIN/password/pattern. cherry-pick from master b88e8577b9 Bug 16242766 Change-Id: I3468215a8ac522a06de6573c93a5f5a6dc72ee2d
b88e8577b9