Set mStatusBarState in NotificationPanelView protected.

Change-Id: I0a8f0070a71b647923e2521ba7bbcaddd9b8e402
(cherry picked from commit 7a8aef9a33819983c2bec821984cc396b813c44a)

packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java

@@ -123,7 +123,7 @@ public class NotificationPanelView extends PanelView implements
     private boolean mKeyguardShowing;
     private boolean mDozing;
     private boolean mDozingOnDown;
-    private int mStatusBarState;
+    protected int mStatusBarState;
     private float mInitialHeightOnTouch;
     private float mInitialTouchX;
     private float mInitialTouchY;