Merge 118772 - REGRESSION(r109729): The optgroup element's "disabled" attribute has no effect to re…

Merge 118772 - REGRESSION(r109729): The optgroup element's "disabled" attribute has no effect to rendering and selection
https://bugs.webkit.org/show_bug.cgi?id=87614

Reviewed by Kent Tamura.

Source/WebCore:

This patch adds HTMLOptGroupElement::disabled and isEnabledFormControl
methods which was implemented in HTMLFormControlElement at r109729 and
updates CSS pseudo class checker to check "optgroup" element.

Tests: fast/forms/select/optgroup-clicking.html
       fast/forms/select/optgroup-disabled.html
       fast/forms/select/optgroup-rendering.html

* css/SelectorChecker.cpp:
(WebCore::SelectorChecker::checkOneSelector): On disabled and enabled pseudo class checker.
We checked tag name "optgroup" in addition isFormControlElement.
* css/StyleResolver.cpp:
(WebCore::StyleResolver::canShareStyleWithElement): Checks optgroup.disabled.
* html/HTMLOptGroupElement.cpp:
(WebCore::HTMLOptGroupElement::disabled): Added.
* html/HTMLOptGroupElement.h:
(HTMLOptGroupElement): Added isEnabledFormControl.

LayoutTests:

Note: An image for optgroup-rendering.html will be change due by
BUG-87719. Color of option elements should be blue (:enabled
pseudo class) instead of green.

* fast/forms/select/optgroup-clicking-expected.txt: Added.
* fast/forms/select/optgroup-clicking.html: Added.
* fast/forms/select/optgroup-disabled-expected.txt: Added.
* fast/forms/select/optgroup-disabled.html: Added.
* fast/forms/select/optgroup-rendering.html: Added.
* platform/chromium/test_expectations.txt: Add MISSING entry for optgroup-rendering.html.
* platform/chromium-linux/fast/forms/select/optgroup-rendering-expected.png: Added.
* platform/chromium-linux/fast/forms/select/optgroup-rendering-expected.txt: Added.


TBR=yosin@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=119186