Support Tab going into fullscreen

Change-Id: Iff65d9c56f3c38119712b01cdd18ce77f52e7337
diff --git a/src/com/android/browser/UI.java b/src/com/android/browser/UI.java
index 70f0880..342fbdc 100644
--- a/src/com/android/browser/UI.java
+++ b/src/com/android/browser/UI.java
@@ -138,6 +138,10 @@
 
     void setFullscreen(boolean enabled);
 
+    void setTabFullscreen(boolean enabled);
+
+    boolean isTabFullScreen();
+
     void setUseQuickControls(boolean enabled);
 
     public boolean shouldCaptureThumbnails();