add fullscreen option

Change-Id: I88299c37a7e809492f806478f41365b56b2687be
diff --git a/src/com/android/browser/UI.java b/src/com/android/browser/UI.java
index 40fc14a..bb34ada 100644
--- a/src/com/android/browser/UI.java
+++ b/src/com/android/browser/UI.java
@@ -132,4 +132,6 @@
     void showAutoLogin(Tab tab);
 
     void hideAutoLogin(Tab tab);
+
+    void setFullscreen(boolean enabled);
 }