When an accessibility service is enabled we are not using the user secure
lock when encrypting the data. If the latter is already used for encryption
we are decreasing the encryption level and therefore shall challenge the
user with their secure lock.
bug:17881324
Change-Id: If8905c05e20bc6bb6a6415e501871e5ad83f3d86
Adds an activity that prompts the user for their PIN/password/pattern.
cherry-pick from master b88e8577b9
Bug 16242766
Change-Id: I3468215a8ac522a06de6573c93a5f5a6dc72ee2d