https://bugs.webkit.org/show_bug.cgi?id=62218

Reviewed by Dimitri Glazkov.

.:

* Source/autotools/symbols.filter:

Source/WebCore:

- updateSpecifiersWithElementName() didn't take nesting into account.
  tag history can contain selector entries which isn't marked as ShadowDescendant yet.
  such entry can be found by investigating isUnknownPseudoElement().
- SelectorChecker::checkSelector() was too strict. Unknown pseudo elements are essentially a kind of class or id
  in implementation perspective. For such, rejecting by missing elementStyle doesn't make sense:
  It isn't a pseudo but a real element for WebCore after all.
- Added Internals::setShadowPseudoId() to create a test harness whose DOM tree contains pseudo shadow ids.

Before this change, following selecdtor chain is created for "p::-shadow-child::-nested-shadow-child":

  [both tag name and -shadow-id are set] <-(ShadowDescendant)- [-nested-shadow-id]

What we want, which is created by this change is:

  [tag] <-(ShadowDescendant)- [-shadow-id is set] <-(ShadowdescenDant)- [-nested-shadow-id]

Test: fast/dom/shadow/shadow-nested-pseudo-id.html

* WebCore.exp.in:
* css/CSSParser.cpp:
(WebCore::CSSParser::updateSpecifiersWithElementName):
* css/SelectorChecker.cpp:
(WebCore::SelectorChecker::checkOneSelector):
* testing/Internals.cpp:
(WebCore::Internals::setShadowPseudoId):
(WebCore):
* testing/Internals.h:
(Internals):
* testing/Internals.idl:

Source/WebKit2:

* win/WebKit2.def:
* win/WebKit2CFLite.def:

LayoutTests:

* fast/dom/shadow/shadow-nested-pseudo-id-expected.txt: Added.
* fast/dom/shadow/shadow-nested-pseudo-id.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@120147 268f45cc-cd09-0410-ab3c-d52691b4dbfc