Add window focus / visibility changed signals to AllAppsSearchPlugin

Change-Id: Ieb48e398cca85dd4343e37fef0015f5e4fece86f
diff --git a/src_plugins/com/android/systemui/plugins/AllAppsSearchPlugin.java b/src_plugins/com/android/systemui/plugins/AllAppsSearchPlugin.java
index 4fa670f..48369a4 100644
--- a/src_plugins/com/android/systemui/plugins/AllAppsSearchPlugin.java
+++ b/src_plugins/com/android/systemui/plugins/AllAppsSearchPlugin.java
@@ -43,6 +43,12 @@
     void onStateTransitionComplete(int state);
 
     /**
+     * Send launcher window focus and visibility changed signals.
+     */
+    void onWindowFocusChanged(boolean hasFocus);
+    void onWindowVisibilityChanged(int visibility);
+
+    /**
      * Send signal when user starts typing, perform search, when search ends
      */
     void startedSearchSession();