add fullscreen option

Change-Id: I88299c37a7e809492f806478f41365b56b2687be
diff --git a/src/com/android/browser/BrowserSettings.java b/src/com/android/browser/BrowserSettings.java
index 9456561..eadd57e 100644
--- a/src/com/android/browser/BrowserSettings.java
+++ b/src/com/android/browser/BrowserSettings.java
@@ -218,6 +218,11 @@
         if (PREF_USE_INSTANT_SEARCH.equals(key)) {
             updateSearchEngine(true);
         }
+        if (PREF_FULLSCREEN.equals(key)) {
+            if (mController.getUi() != null) {
+                mController.getUi().setFullscreen(useFullscreen());
+            }
+        }
     }
 
     static String getFactoryResetHomeUrl(Context context) {
@@ -556,6 +561,10 @@
         return mPrefs.getBoolean(PREF_USE_INSTANT_SEARCH, false);
     }
 
+    public boolean useFullscreen() {
+        return mPrefs.getBoolean(PREF_FULLSCREEN, false);
+    }
+
     // -----------------------------
     // getter/setters for privacy_security_preferences.xml
     // -----------------------------