ActionBar tab mode using fragments; needs styles.

Change-Id: I8f931dae447e7b64de827d3c17766e5f8ad794e2
diff --git a/core/java/android/app/Activity.java b/core/java/android/app/Activity.java
index 8825b8c..4166b89 100644
--- a/core/java/android/app/Activity.java
+++ b/core/java/android/app/Activity.java
@@ -1676,11 +1676,11 @@
      */
     private void initActionBar() {
         Window window = getWindow();
-        if (!window.hasFeature(Window.FEATURE_ACTION_BAR)) {
+        if (!window.hasFeature(Window.FEATURE_ACTION_BAR) || mActionBar != null) {
             return;
         }
         
-        mActionBar = new ActionBarImpl(getWindow().getDecorView());
+        mActionBar = new ActionBarImpl(this);
     }
     
     /**