Fix crash from AssistManager

It expects to have onConfiguration called at least once, so
make sure it has.

Test: runtest systemui
Bug: 34377261
Change-Id: Iba980b020ef2c175c7ffebedf946edb282be464c
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java
index c0f245c..3423a3c 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NavigationBarFragment.java
@@ -45,6 +45,7 @@
 import android.os.PowerManager;
 import android.os.RemoteException;
 import android.os.UserHandle;
+import android.support.annotation.VisibleForTesting;
 import android.telecom.TelecomManager;
 import android.text.TextUtils;
 import android.util.Log;
@@ -447,7 +448,8 @@
         return false;
     }
 
-    private boolean onHomeLongClick(View v) {
+    @VisibleForTesting
+    boolean onHomeLongClick(View v) {
         if (shouldDisableNavbarGestures()) {
             return false;
         }
@@ -562,6 +564,7 @@
 
     public void setAssistManager(AssistManager assistManager) {
         mAssistManager = assistManager;
+        mAssistManager.onConfigurationChanged();
     }
 
     public void setLightBarController(LightBarController lightBarController) {