QS: Reset user activity timeout on the lockscreen.

If the quick settings panel changes, call userActivity to
delay the screen timeout.

Bug:15166195
Change-Id: Ie32fb39c5a975d9cf0d80d7fdf711177028a6b5c
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
index 142241c..0a44904 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
@@ -478,6 +478,7 @@
         mHeader.setExpansion(height);
         setQsTranslation(height);
         setQsStackScrollerPadding(height);
+        mStatusBar.userActivity();
     }
 
     private void setQsTranslation(float height) {