[EFL] Add virtual method to notify user when wrapping focus

[EFL] Add virtual method to notify user when wrapping focus
https://bugs.webkit.org/show_bug.cgi?id=68699

Reviewed by Antonio Gomes.

Add a virtual method to ewk_view, so the Chrome gets notified if we
finished focusing all the items and would start over. This way the
browser can decide to handle the subsequent focus changes among its
widgets.

* WebCoreSupport/ChromeClientEfl.cpp: call ewk_view's virtual method to
give it a chance to grab focus
(WebCore::ChromeClientEfl::canTakeFocus):
* ewk/ewk_private.h:
* ewk/ewk_view.cpp: add virtual method
(ewk_view_focus_can_cycle):
* ewk/ewk_view.h: add focus direction enum and virtual method

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@95983 268f45cc-cd09-0410-ab3c-d52691b4dbfc