https://bugs.webkit.org/show_bug.cgi?id=122060

Reviewed by Antti Koivisto.

As a step to generate toCSSFooValue, toCSSGradientValuem toCSSLinearGradientValue and
toCSSRadialGradient are generated. isLinearGradient() and isRadialGradient() are moved
from each class to CSSValue in order to generate toCSSFooValue.

No new tests, no behavior change.

* css/CSSGradientValue.cpp:
(WebCore::CSSGradientValue::image):
(WebCore::CSSGradientValue::gradientWithStylesResolved):
* css/CSSGradientValue.h:
* css/CSSImageGeneratorValue.cpp:
(WebCore::CSSImageGeneratorValue::image):
(WebCore::CSSImageGeneratorValue::fixedSize):
(WebCore::CSSImageGeneratorValue::loadSubimages):
* css/CSSParser.cpp:
(WebCore::CSSParser::parseDeprecatedGradient):
* css/CSSValue.cpp:
(WebCore::CSSValue::destroy):
* css/CSSValue.h:
(WebCore::CSSValue::isLinearGradient):
(WebCore::CSSValue::isRadialGradient):
* css/StyleResolver.cpp:
(WebCore::StyleResolver::applyProperty):
(WebCore::StyleResolver::styleImage):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@156636 268f45cc-cd09-0410-ab3c-d52691b4dbfc