[CSS Grid Layout] Add ENABLE flag

[CSS Grid Layout] Add ENABLE flag
https://bugs.webkit.org/show_bug.cgi?id=129153

Reviewed by Simon Fraser.

.:

Added the ENABLE_CSS_GRID_LAYOUT feature flag to the cmake and
autotools build systems. The feature is disabled by default for
production builds.

* Source/autotools/SetupWebKitFeatures.m4:
* Source/cmake/OptionsEfl.cmake:
* Source/cmake/OptionsGTK.cmake:
* Source/cmake/WebKitFeatures.cmake:
* Source/cmakeconfig.h.cmake:

Source/JavaScriptCore:

* Configurations/FeatureDefines.xcconfig: added ENABLE_CSS_GRID_LAYOUT feature flag.

Source/WebCore:

Added ENABLE_CSS_GRID_LAYOUT feature flag.

* Configurations/FeatureDefines.xcconfig:
* css/CSSComputedStyleDeclaration.cpp:
(WebCore::isLayoutDependent):
(WebCore::ComputedStyleExtractor::propertyValue):
* css/CSSGridTemplateAreasValue.cpp:
* css/CSSGridTemplateAreasValue.h:
* css/CSSParser.cpp:
(WebCore::CSSParserContext::CSSParserContext):
(WebCore::operator==):
(WebCore::isValidKeywordPropertyAndValue):
(WebCore::isKeywordPropertyID):
(WebCore::CSSParser::parseValue):
* css/CSSParser.h:
* css/CSSParserMode.h:
* css/CSSPrimitiveValueMappings.h:
(WebCore::CSSPrimitiveValue::CSSPrimitiveValue):
* css/CSSPropertyNames.in:
* css/CSSValue.cpp:
(WebCore::CSSValue::equals):
(WebCore::CSSValue::cssText):
(WebCore::CSSValue::destroy):
* css/DeprecatedStyleBuilder.cpp:
(WebCore::DeprecatedStyleBuilder::DeprecatedStyleBuilder):
* css/StyleProperties.cpp:
(WebCore::StyleProperties::getPropertyValue):
* css/StylePropertyShorthand.cpp:
(WebCore::shorthandForProperty):
(WebCore::matchingShorthandsForLonghand):
* css/StyleResolver.cpp:
(WebCore::equivalentBlockDisplay):
(WebCore::StyleResolver::adjustRenderStyle):
(WebCore::StyleResolver::applyProperty):
* css/StyleResolver.h:
* dom/Document.cpp:
* dom/Document.h:
* rendering/RenderElement.cpp:
(WebCore::RenderElement::createFor):
* rendering/RenderGrid.cpp:
* rendering/RenderGrid.h:
* rendering/style/GridCoordinate.h:
* rendering/style/GridLength.h:
* rendering/style/GridPosition.h:
* rendering/style/GridTrackSize.h:
* rendering/style/RenderStyle.cpp:
(WebCore::RenderStyle::changeRequiresLayout):
* rendering/style/RenderStyle.h:
* rendering/style/RenderStyleConstants.h:
* rendering/style/StyleAllInOne.cpp:
* rendering/style/StyleGridData.cpp:
* rendering/style/StyleGridData.h:
* rendering/style/StyleGridItemData.cpp:
* rendering/style/StyleGridItemData.h:
* rendering/style/StyleRareNonInheritedData.cpp:
(WebCore::StyleRareNonInheritedData::StyleRareNonInheritedData):
(WebCore::StyleRareNonInheritedData::operator==):
* rendering/style/StyleRareNonInheritedData.h:

Source/WebKit/mac:

Added ENABLE_CSS_GRID_LAYOUT feature flag.

* Configurations/FeatureDefines.xcconfig:

Source/WebKit2:

Added ENABLE_CSS_GRID_LAYOUT feature flag.

* Configurations/FeatureDefines.xcconfig:
* WebProcess/WebPage/WebPage.cpp:
(WebKit::WebPage::updatePreferences):

Tools:

Added ENABLE_CSS_GRID_LAYOUT feature flag. It's on by default for
all ports for developer builds.

* Scripts/webkitperl/FeatureList.pm:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@164659 268f45cc-cd09-0410-ab3c-d52691b4dbfc