Move Tab layout code to UI

Change-Id: Ic2d81345883bba22329b4f805c44a68b14e174e3
diff --git a/src/com/android/browser/UI.java b/src/com/android/browser/UI.java
index 3a8a5cd..e7f67f2 100644
--- a/src/com/android/browser/UI.java
+++ b/src/com/android/browser/UI.java
@@ -58,6 +58,8 @@
 
     public void attachTab(Tab tab);
 
+    public void onSetWebView(Tab tab, WebView view);
+
     public void createSubWindow(Tab tab, WebView subWebView);
 
     public void attachSubWindow(View subContainer);