https://bugs.webkit.org/show_bug.cgi?id=95619

Reviewed by Dean Jackson.

This patch adds a new class ClipPathOperation to manage the values of the
-webkit-clip-path property. ClipPathOperation stores a Path object for clipping and is
a preparation for IRI references of the SVG 'clipPath' element.

The structure of ClipPathOperation is simular to FilterOperation.

ClipPathOperation will be extended to support IRI references directly in a second patch.

No new tests. The changes just affect the backend.

* GNUmakefile.list.am: Added new ClipPathOperation class.
* WebCore.gypi: Ditto.
* WebCore.vcproj/WebCore.vcproj: Ditto.
* WebCore.xcodeproj/project.pbxproj: Ditto.
* css/CSSComputedStyleDeclaration.cpp: Use ClipPathOperation instead of BasicShape.
(WebCore::CSSComputedStyleDeclaration::getPropertyCSSValue): Ditto.
* css/StyleBuilder.cpp: Ditto.
(WebCore):
(WebCore::ApplyPropertyClipPath::setValue):
(WebCore::ApplyPropertyClipPath::applyValue):
(WebCore::ApplyPropertyClipPath::createHandler):
* rendering/ClipPathOperation.h: Added. New handler for property values (BasicShape, references).
(WebCore):
(ClipPathOperation):
(WebCore::ClipPathOperation::~ClipPathOperation):
(WebCore::ClipPathOperation::operator!=):
(WebCore::ClipPathOperation::getOperationType): Return the operation type.
(WebCore::ClipPathOperation::isSameType): Helper function for =operator.
(WebCore::ClipPathOperation::ClipPathOperation):
(ShapeClipPathOperation): Inheriting class for managing BasicShapes.
(WebCore::ShapeClipPathOperation::create):
(WebCore::ShapeClipPathOperation::basicShape):
(WebCore::ShapeClipPathOperation::windRule):
(WebCore::ShapeClipPathOperation::path):
(WebCore::ShapeClipPathOperation::operator==):
(WebCore::ShapeClipPathOperation::ShapeClipPathOperation):
* rendering/RenderLayer.cpp: Use ClipPathOperation to apply clipping.
(WebCore::RenderLayer::paintLayerContents):
* rendering/style/RenderStyle.h:
* rendering/style/StyleRareNonInheritedData.h:
(StyleRareNonInheritedData):
* rendering/svg/SVGRenderingContext.cpp: Ditto.
(WebCore::SVGRenderingContext::prepareToRenderSVGContent):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@128700 268f45cc-cd09-0410-ab3c-d52691b4dbfc