Show hideycling for non-primary users.

User 0 owns the window (system_server) but should be allowed
to display on a user's behalf.

Use the corresponding private flag for this system window, since
we cannot classify it by type (TYPE_TOAST) in policy.

Bug:12015090
Change-Id: I33aedb4624288415a5e1ae937676b693024546a9

policy/src/com/android/internal/policy/impl/ImmersiveModeConfirmation.java

@@ -178,6 +178,7 @@ public class ImmersiveModeConfirmation {
                         | WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED
                 ,
                 PixelFormat.TRANSLUCENT);
+        lp.privateFlags |= WindowManager.LayoutParams.PRIVATE_FLAG_SHOW_FOR_ALL_USERS;
         lp.setTitle("ImmersiveModeConfirmation");
         lp.windowAnimations = com.android.internal.R.style.Animation_RecentApplications;
         lp.gravity = Gravity.FILL;