diff --git a/include/input/InputWindow.h b/include/input/InputWindow.h
index 8dd95cf..2b8cc57 100644
--- a/include/input/InputWindow.h
+++ b/include/input/InputWindow.h
@@ -225,6 +225,11 @@
     virtual bool updateInfo() = 0;
 
     /**
+     * Updates from another input window handle.
+     */
+    void updateFrom(const sp<InputWindowHandle> handle);
+
+    /**
      * Releases the channel used by the associated information when it is
      * no longer needed.
      */