Disable face unlock when returning from camera.

Bug: 11063890

- Workaround for bug 11063890.  Avoids the acquire/release
  race when resuming face unlock while pausing the camera
  widget.
Change-Id: I0a58f3a07f346da72ea55772242b4f9c54537235

packages/Keyguard/src/com/android/keyguard/KeyguardActivityLauncher.java

@@ -99,6 +99,11 @@ public abstract class KeyguardActivityLauncher {
 
     public void launchCamera(Handler worker, Runnable onSecureCameraStarted) {
         LockPatternUtils lockPatternUtils = getLockPatternUtils();
+
+        // Workaround to avoid camera release/acquisition race when resuming face unlock
+        // after showing lockscreen camera (bug 11063890).
+        KeyguardUpdateMonitor.getInstance(getContext()).setAlternateUnlockEnabled(false);
+
         if (lockPatternUtils.isSecure()) {
             // Launch the secure version of the camera
             if (wouldLaunchResolverActivity(SECURE_CAMERA_INTENT)) {