Fix bug 5258435 - ActionBar.setBackgroundDrawable

Fix this call to work properly and add methods for setting
split/stacked bar backgrounds to match existing styleable elements.

Change-Id: I8c6b1c598af1110f84a9098683d8e0226daf2e27

core/java/android/app/ActionBar.java

@@ -402,12 +402,32 @@ public abstract class ActionBar {
     public abstract void setDisplayShowCustomEnabled(boolean showCustom);
 
     /**
-     * Set the ActionBar's background.
+     * Set the ActionBar's background. This will be used for the primary
+     * action bar.
      * 
      * @param d Background drawable
+     * @see #setStackedBackgroundDrawable(Drawable)
+     * @see #setSplitBackgroundDrawable(Drawable)
      */
     public abstract void setBackgroundDrawable(Drawable d);
 
+    /**
+     * Set the ActionBar's stacked background. This will appear
+     * in the second row/stacked bar on some devices and configurations.
+     *
+     * @param d Background drawable for the stacked row
+     */
+    public abstract void setStackedBackgroundDrawable(Drawable d);
+
+    /**
+     * Set the ActionBar's split background. This will appear in
+     * the split action bar containing menu-provided action buttons
+     * on some devices and configurations.
+     *
+     * @param d Background drawable for the split bar
+     */
+    public abstract void setSplitBackgroundDrawable(Drawable d);
+
     /**
      * @return The current custom view.
      */