Merge 118721 - Form controls in <fieldset disabled> should not be validated.

Merge 118721 - Form controls in <fieldset disabled> should not be validated.
https://bugs.webkit.org/show_bug.cgi?id=87381

Reviewed by Hajime Morita.

Source/WebCore:

We need to use disabeld() instead of m_disabled to calculate
willValidate property. Also, we need to update willValidate if
necessary.

Test: fast/forms/fieldset/validation-in-fieldset.html

* html/HTMLFieldSetElement.cpp:
(WebCore::HTMLFieldSetElement::disabledAttributeChanged):
 - Do not traverse this.
 - Calls ancestorDisabledStateWasChanged() instead of
  setNeedsStyleRecalc() because we'd like to do additional tasks.
* html/HTMLFormControlElement.cpp:
(WebCore::HTMLFormControlElement::ancestorDisabledStateWasChanged):
Added. Just calls disabledAttributeChanged().
(WebCore::HTMLFormControlElement::parseAttribute):
Do not call setNeedsWillValidateCheck() whenever an attribute is updated.
It should be called only if disabled or readonly attribute is updated.
(WebCore::HTMLFormControlElement::disabledAttributeChanged):
Add setNeedsWillValidateCheck(). It was moved from parseAttribute().
(WebCore::HTMLFormControlElement::insertedInto):
Invalidate ancestor information.
(WebCore::HTMLFormControlElement::recalcWillValidate):
Use disabled() instead of m_disabled. disabled() takes care of
ancestor's disabled state.
* html/HTMLFormControlElement.h:
(HTMLFormControlElement):

LayoutTests:

* fast/forms/fieldset/validation-in-fieldset-expected.txt: Added.
* fast/forms/fieldset/validation-in-fieldset.html: Added.

TBR=tkent@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=119199

[tkent, 2012-06-01 08:30:26]

LGTM