Add support for SVG Clip paths in HTML

Source/core/rendering/RenderLayer.h

Index: Source/core/rendering/RenderLayer.h
diff --git a/Source/core/rendering/RenderLayer.h b/Source/core/rendering/RenderLayer.h
index 5871a502fb9036b79b1d2b1bb0f9a6679b22da5e..29f7262bd862c5096f631565f70319d24e22aced 100644
--- a/Source/core/rendering/RenderLayer.h
+++ b/Source/core/rendering/RenderLayer.h
@@ -49,6 +49,7 @@
 #include "core/rendering/LayerPaintingInfo.h"
 #include "core/rendering/RenderBox.h"
 #include "core/rendering/RenderLayerBlendInfo.h"
+#include "core/rendering/RenderLayerClipPathInfo.h"
 #include "core/rendering/RenderLayerClipper.h"
 #include "core/rendering/RenderLayerFilterInfo.h"
 #include "core/rendering/RenderLayerReflectionInfo.h"
@@ -385,6 +386,33 @@ public:
 
     void updateFilters(const RenderStyle* oldStyle, const RenderStyle* newStyle);
 
+    bool hasClipPath() const
+    {
+        return renderer()->hasClipPath();
+    }
+    bool hasClipPathInfo() const
+    {
+        return m_hasClipPathInfo;
+    }
+    void setHasClipPathInfo(bool hasClipPathInfo)
+    {
+        m_hasClipPathInfo = hasClipPathInfo;
+    }
+    void updateClipPath(const RenderStyle* oldStyle, const RenderStyle* newStyle);
+    void removeClipPathInfoIfNeeded()
+    {
+        if (hasClipPathInfo())
+            RenderLayerClipPathInfo::removeClipPathInfoForRenderLayer(this);
+    }
+    RenderLayerClipPathInfo* clipPathInfo() const
+    {
+        return hasClipPathInfo() ? RenderLayerClipPathInfo::clipPathInfoForRenderLayer(this) : 0;
+    }
+    RenderLayerClipPathInfo* ensureClipPathInfo()
+    {
+        return RenderLayerClipPathInfo::createClipPathInfoForRenderLayerIfNeeded(this);
+    }
+
     Node* enclosingElement() const;
 
     bool isInTopLayer() const;
@@ -659,6 +687,7 @@ private:
     bool update3DTransformedDescendantStatus();
 
     void updateOrRemoveFilterClients();
+    void updateOrRemoveClipPathClients();
 
     LayoutRect paintingExtent(const RenderLayer* rootLayer, const LayoutRect& paintDirtyRect, const LayoutSize& subPixelAccumulation, PaintBehavior);
 
@@ -702,6 +731,7 @@ private:
     unsigned m_containsDirtyOverlayScrollbars : 1;
 
     unsigned m_hasFilterInfo : 1;
+    unsigned m_hasClipPathInfo : 1;
     unsigned m_needsAncestorDependentCompositingInputsUpdate : 1;
     unsigned m_needsDescendantDependentCompositingInputsUpdate : 1;
     unsigned m_childNeedsCompositingInputsUpdate : 1;