Reviewed by Darin Adler.

        Add tests for HTMLInputElement::stepUp() and stepDown().
        https://bugs.webkit.org/show_bug.cgi?id=27451

        * fast/forms/input-step-number-expected.txt: Added.
        * fast/forms/input-step-number.html: Added.
        * fast/forms/input-step-range-expected.txt: Added.
        * fast/forms/input-step-range.html: Added.
        * fast/forms/input-step-unsupported-expected.txt: Added.
        * fast/forms/input-step-unsupported.html: Added.
        * fast/forms/script-tests/input-step-number.js: Added.
        * fast/forms/script-tests/input-step-range.js: Added.
        * fast/forms/script-tests/input-step-unsupported.js: Added.

2009-12-07  Kent Tamura  <tkent@chromium.org>

        Reviewed by Darin Adler.

        Add support for HTMLInputElement::stepUp() and stepDown() for
        type=number and type=range.
        https://bugs.webkit.org/show_bug.cgi?id=27451

        Our implementation of stepUp() and stepDown() rounds the resultant
        value to conform to the step value.
        Change the number-string conversion method for RenderSlider to be
        consistent with type=number.

        Tests: fast/forms/input-step-number.html
               fast/forms/input-step-range.html
               fast/forms/input-step-unsupported.html

        * html/HTMLInputElement.cpp:
        (WebCore::HTMLInputElement::rangeUnderflow): Unify the code for NUMBER and RANGE.
        (WebCore::HTMLInputElement::rangeOverflow): Unify the code for NUMBER and RANGE.
        (WebCore::HTMLInputElement::minimum): Renamed from rangeMinimum(), and support for NUMBER.
        (WebCore::HTMLInputElement::maximum): Renamed from rangeMaximum(), and support for NUMBER.
        (WebCore::HTMLInputElement::stepBase):
        (WebCore::HTMLInputElement::stepMismatch): Use stepBase().
        (WebCore::HTMLInputElement::applyStepForNumberOrRange):
        (WebCore::HTMLInputElement::stepUp):
        (WebCore::HTMLInputElement::stepDown):
        (WebCore::HTMLInputElement::formStringFromDouble):
        * html/HTMLInputElement.h:
        (WebCore::HTMLInputElement::stepUp):
        (WebCore::HTMLInputElement::stepDown):
        * html/HTMLInputElement.idl: Add stepUp() and stepDown().
        * rendering/RenderSlider.cpp:
        (WebCore::SliderRange::SliderRange): Sync with rangeMinimum()/rangeMaximum() renaming.
        (WebCore::RenderSlider::updateFromElement): Use formStringFromDouble().
        (WebCore::RenderSlider::setValueForPosition): Use formStringFromDouble().

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@51822 268f45cc-cd09-0410-ab3c-d52691b4dbfc