Fix 2241848 - 3D apps folder does not send accessibility events

It's now sending them.  The beeping and vibrating accessibility things
work, but we only have prebuilts for the speech one and it's not saying
anything and I can't debug it, so this will have to do.

src/com/android/launcher2/HandleView.java

@@ -45,6 +45,8 @@ public class HandleView extends ImageView {
         TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.HandleView, defStyle, 0);
         mOrientation = a.getInt(R.styleable.HandleView_direction, ORIENTATION_HORIZONTAL);
         a.recycle();
+
+        setContentDescription(context.getString(R.string.all_apps_button_label));
     }
 
     @Override