https://bugs.webkit.org/show_bug.cgi?id=95169

Reviewed by Kent Tamura.

This patch introduces new virtual function HTMLElement::hasCustomFocusLogic()
to allow input type implementations to use shadow element with focus
navigation.

No new tests. This patch doesn't change behavior.

(WebCore::HTMLElement::hasCustomFocusLogic): Added to return false as
default value.
* html/HTMLElement.h:
(HTMLElement): Added a declaration of hasCustomFocusLogic().
* html/HTMLInputElement.cpp:
(WebCore::HTMLInputElement::hasCustomFocusLogic): Added to call InputType::hasCustomFocusLogic(),
* html/HTMLInputElement.h:
(HTMLInputElement): Added a declaration of hasCustomFocusLogic().
* html/HTMLMediaElement.cpp:
(WebCore::HTMLMediaElement::hasCustomFocusLogic): Added to return true for "audio" and "video" elements.
* html/HTMLMediaElement.h:
(HTMLMediaElement): Add a declaration of hasCustomFocusLogic()
* html/HTMLTextAreaElement.cpp:
(WebCore::HTMLTextAreaElement::hasCustomFocusLogic): Added to return true.
* html/HTMLTextAreaElement.h:
(HTMLTextAreaElement): Add a declaration of hasCustomFocusLogic().
* page/FocusController.cpp:
(WebCore::hasCustomFocusLogic): Changed to call HTMLElement::hasCustomFocusLogic()
rather than checking tag names.
* html/InputType.cpp:
(WebCore::InputType::hasCustomFocusLogic): Added to return true as default value.
* html/InputType.h:
(InputType): Added a declaration of hasCustomFocusLogic().

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@126842 268f45cc-cd09-0410-ab3c-d52691b4dbfc