Reviewed by Anders Carlsson.

        Add spread radius support to -webkit-box-shadow
        https://bugs.webkit.org/show_bug.cgi?id=27417

        Test: fast/box-shadow/spread.html

        * css/CSSComputedStyleDeclaration.cpp:
        (WebCore::valueForShadow): Added a property ID parameter and used it to
            include the spread length for box-shadow but not for text-shadow.
        (WebCore::CSSComputedStyleDeclaration::getPropertyCSSValue):
            Pass the property ID to valueForShadow().

        * css/CSSParser.cpp:
        (WebCore::ShadowParseContext::ShadowParseContext): Added property,
            spread, and allowSpread members. Added a property ID parameter to
            the constructor. Initialize the property and allowSpread members.
        (WebCore::ShadowParseContext::allowLength): Added allowSpread.
        (WebCore::ShadowParseContext::commitValue): Pass the spread value to
            the ShadowValue constructor. Reset allowSpread.
        (WebCore::ShadowParseContext::commitLength): Allow spread after blur
            for the box-shadow property.
        (WebCore::ShadowParseContext::commitColor): Reset allowSpread.
        (WebCore::CSSParser::parseShadow): Pass the property ID to
            ShadowParseContext().

        * css/CSSStyleSelector.cpp:
        (WebCore::CSSStyleSelector::applyProperty): Get the spread value from
            the shadow value and pass it to the ShadowData constructor.

        * css/ShadowValue.cpp:
        (WebCore::ShadowValue::ShadowValue): Added spread.
        (WebCore::ShadowValue::cssText): Added spread.

        * css/ShadowValue.h:
        (WebCore::ShadowValue::create): Added spread.

        * page/animation/AnimationBase.cpp:
        (WebCore::blendFunc): Blend the spread value.
        (WebCore::PropertyWrapperShadow::blend): Added 0 spread to the default
            shadow.

        * rendering/InlineFlowBox.cpp:
        (WebCore::InlineFlowBox::placeBoxesHorizontally): Account for spread in
            the visual overflow calculations.
        (WebCore::InlineFlowBox::placeBoxesVertically): Ditto.
        (WebCore::InlineFlowBox::paint): Ditto.

        * rendering/RenderBlock.cpp:
        (WebCore::RenderBlock::overflowHeight): Ditto.
        (WebCore::RenderBlock::overflowWidth): Ditto.
        (WebCore::RenderBlock::overflowLeft): Ditto.
        (WebCore::RenderBlock::overflowTop): Ditto.
        (WebCore::RenderBlock::overflowRect): Ditto.
        (WebCore::RenderBlock::layoutBlock): Ditto.

        * rendering/RenderBoxModelObject.cpp:
        (WebCore::RenderBoxModelObject::paintBoxShadow): Inflate the shadow-
            casting rect by the shadow spread value. Adjust border radii if
            necessary.

        * rendering/RenderFlexibleBox.cpp:
        (WebCore::RenderFlexibleBox::layoutBlock): Account for spread in the
            visual overflow calculations.
        * rendering/RenderLayer.cpp:
        (WebCore::RenderLayer::calculateRects): Ditto.

        * rendering/RenderObject.cpp:
        (WebCore::RenderObject::repaintAfterLayoutIfNeeded): Account for spread.
        (WebCore::RenderObject::adjustRectForOutlineAndShadow): Ditto.

        * rendering/RenderReplaced.cpp:
        (WebCore::RenderReplaced::adjustOverflowForBoxShadowAndReflect): Ditto.

        * rendering/style/RenderStyle.cpp:
        (WebCore::RenderStyle::setTextShadow): Assert that text shadows do not
            have spread.

        * rendering/style/ShadowData.cpp:
        (WebCore::ShadowData::ShadowData): Added spread.
        (WebCore::ShadowData::operator==): Compare spread.
        * rendering/style/ShadowData.h:
        (WebCore::ShadowData::ShadowData): Added spread.

LayoutTests:

        Reviewed by Anders Carlsson.

        Test box-shadow spread radius
        https://bugs.webkit.org/show_bug.cgi?id=27417

        * fast/box-shadow/spread.html: Added.
        * platform/mac/fast/box-shadow/spread-expected.checksum: Added.
        * platform/mac/fast/box-shadow/spread-expected.png: Added.
        * platform/mac/fast/box-shadow/spread-expected.txt: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@46097 268f45cc-cd09-0410-ab3c-d52691b4dbfc