Fix the build from two breaking changes (update to current.xml and ViewRoot import)

Change-Id: I987b12f7c5fdd4137faa55405fce99bd6f73fc71
diff --git a/core/java/android/view/ViewRoot.java b/core/java/android/view/ViewRoot.java
index 692d196..faa4783 100644
--- a/core/java/android/view/ViewRoot.java
+++ b/core/java/android/view/ViewRoot.java
@@ -33,6 +33,7 @@
 import android.util.DisplayMetrics;
 import android.util.Log;
 import android.util.EventLog;
+import android.util.Slog;
 import android.util.SparseArray;
 import android.view.View.MeasureSpec;
 import android.view.accessibility.AccessibilityEvent;