Added back removed ctor from DisplayEventReceiver

...because some app can't help but access hidden APIs...

Test: builds
Change-Id: Ia1d4a71b46a53b44e3ebe5844e446009785a90ac
Fixes: 62719884

core/java/android/view/DisplayEventReceiver.java

@@ -68,6 +68,15 @@ public abstract class DisplayEventReceiver {
     @FastNative
     private static native void nativeScheduleVsync(long receiverPtr);
 
+    /**
+     * Creates a display event receiver.
+     *
+     * @param looper The looper to use when invoking callbacks.
+     */
+    public DisplayEventReceiver(Looper looper) {
+        this(looper, VSYNC_SOURCE_APP);
+    }
+
     /**
      * Creates a display event receiver.
      *