Add fullscreen to Dream.lightsOut().

Also don't go into lightsOut() by default in
onAttachedToWindow(), in case some dream doesn't want to do
that.

We should probably make this even more flexible, but
this is a start.

Change-Id: I606b42a288259902e89d59595ad60548a89866da

core/java/android/service/dreams/Dream.java

@@ -172,11 +172,6 @@ public class Dream extends Service implements Window.Callback {
 
     @Override
     public void onAttachedToWindow() {
-        mWindow.addFlags(
-                WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
-                | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
-        );
-        lightsOut();
     }
 
     @Override
@@ -306,7 +301,8 @@ public class Dream extends Service implements Window.Callback {
         // turn the lights down low
         final View v = mWindow.getDecorView();
         if (v != null) {
-            v.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE);
+            v.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE 
+                                  | View.SYSTEM_UI_FLAG_FULLSCREEN);
         }
     }