Register for interstitial page state notification

- Block clicking on favicon when showing interstitial page
- Ensure topcontrols is always shown when showing interstitial page
diff --git a/src/com/android/browser/Tab.java b/src/com/android/browser/Tab.java
index a86b2e6..f533f6c 100644
--- a/src/com/android/browser/Tab.java
+++ b/src/com/android/browser/Tab.java
@@ -666,6 +666,20 @@
                 ui.forceDisableFullscreenMode(popup);
             }
         }
+
+        @Override
+        public void onAttachInterstitialPage(WebView mWebView) {
+            Controller controller = (Controller)mWebViewController;
+            BaseUi ui = (BaseUi) controller.getUi();
+            ui.getTitleBar().showTopControls(false);
+        }
+
+        @Override
+        public void onDetachInterstitialPage(WebView mWebView) {
+            Controller controller = (Controller)mWebViewController;
+            BaseUi ui = (BaseUi) controller.getUi();
+            ui.getTitleBar().enableTopControls(true);
+        }
     };
 
     private void syncCurrentState(WebView view, String url) {