Expose KeyguardMonitor.isOccluded().

Bug: 63806767
Test: runtest systemui

Change-Id: I36b96974c7a27e31ddbc3e8cdddf2516cce87b21

packages/SystemUI/src/com/android/systemui/statusbar/policy/KeyguardMonitor.java

@@ -21,12 +21,13 @@ public interface KeyguardMonitor extends CallbackController<Callback> {
     boolean isSecure();
     boolean canSkipBouncer();
     boolean isShowing();
+    boolean isOccluded();
     boolean isKeyguardFadingAway();
     boolean isKeyguardGoingAway();
     long getKeyguardFadingAwayDuration();
     long getKeyguardFadingAwayDelay();
 
-    public interface Callback {
+    interface Callback {
         void onKeyguardShowingChanged();
     }
 }

packages/SystemUI/tests/src/com/android/systemui/utils/leaks/FakeKeyguardMonitor.java

@@ -46,6 +46,11 @@ public class FakeKeyguardMonitor implements KeyguardMonitor {
         return false;
     }
 
+    @Override
+    public boolean isOccluded() {
+        return false;
+    }
+
     @Override
     public boolean isKeyguardFadingAway() {
         return false;