https://bugs.webkit.org/show_bug.cgi?id=68773

Reviewed by Daniel Bates.

Source/WebCore: 

Treat bdi elements without dir content attribute as if they have dir=auto per spec:
http://www.whatwg.org/specs/web-apps/current-work/multipage/text-level-semantics.html#the-bdi-element

The patch tries to encapsulate the logic to look for dir content attribute and dir=auto.

It also adds HTMLBDIElement interface (binding remains to use HTMLElement) to set
selfOrAncestorHasDirAutoAttribute flag true by default, which is used by functions like
directionalityIfhasDirAutoAttribute to look for elements with dir=auto. Since dir=auto-ness of bdi
elements can be overridden by dir content attribute, we must change and only change the default value.

Tests: fast/text/international/bdi-dir-default-to-auto-expected.html
       fast/text/international/bdi-dir-default-to-auto.html

* GNUmakefile.list.am:
* Target.pri:
* WebCore.gypi:
* WebCore.vcproj/WebCore.vcproj:
* WebCore.xcodeproj/project.pbxproj:
* css/CSSStyleSelector.cpp:
(WebCore::CSSStyleSelector::collectMatchingRulesForList):
* html/HTMLBDIElement.h: Added.
(WebCore):
(HTMLBDIElement):
(WebCore::HTMLBDIElement::create):
(WebCore::HTMLBDIElement::HTMLBDIElement): Sets selfOrAncestorHasDirAutoAttribute to true because
bdi elements are treated as if it has dir=auto by default.
* html/HTMLElement.cpp:
(WebCore::elementAffectsDirectionality): Added. Checks if the specified element is bdi or
has dir content attribute.
(WebCore):
(WebCore::setHasDirAutoFlagRecursively):
(WebCore::HTMLElement::hasDirectionAuto): Added. Checks if the specified element should be treated
as if it has dir=auto (bdi or element with dir=auto).
(WebCore::HTMLElement::directionalityIfhasDirAutoAttribute):
(WebCore::HTMLElement::adjustDirectionalityIfNeededAfterChildAttributeChanged):
(WebCore::HTMLElement::adjustDirectionalityIfNeededAfterChildrenChanged):
* html/HTMLElement.h:
(HTMLElement):
* html/HTMLTagNames.in: Use HTMLBDIElement instead of HTMLElement for constructing bdi element
to set selfOrAncestorHasDirAutoAttribute true but still use HTMLElement for binding.

LayoutTests: 

Add a test written by Aharon Lanin.

* fast/text/international/bdi-dir-default-to-auto-expected.html: Added.
* fast/text/international/bdi-dir-default-to-auto.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@111632 268f45cc-cd09-0410-ab3c-d52691b4dbfc