Fxing issues with the scroll bar

- Removing track from AllApps
- Scrollbar should reach edge of track now
- Fixing flashing when going from AppsCustomize to workspace and switching tabs in AppsCustomize

Change-Id: Id69bd04dc503608566c3a33a1344904e3db383bf

src/com/android/launcher2/Workspace.java

@@ -3339,4 +3339,11 @@ public class Workspace extends SmoothPagedView
     public void getLocationInDragLayer(int[] loc) {
         mLauncher.getDragLayer().getLocationInDragLayer(this, loc);
     }
+
+    /**
+     * Return true because we want the scrolling indicator to stretch to fit the space.
+     */
+    protected boolean hasElasticScrollIndicator() {
+        return true;
+    }
 }