Report keyguard as initially showing and secure until we know

This fixes a bug where an app calls KeyguardManager.isLocked()
before keyguard has had a chance to show.  The fix is to assume
keyguard is showing and secure until we know otherwise.

Fixes bug 11670159

Change-Id: Ifbe4cdf40e3b76d2069ecace940f85fa58f31187
2 files changed