Only send a direction key if we are not in touch mode.

Bug:3395047

requestFocus() sends a direction key, in case the user
focused the WebView using that direction key.  However,
in touch mode, the user used touch to give focus, so
do not send a directional key.

Change-Id: I052d30639d1caefd39077b0498a1e0d21c157a9a