WIP for display item list backed by ListContainer

Source/platform/graphics/paint/ClipPathDisplayItem.h

Index: Source/platform/graphics/paint/ClipPathDisplayItem.h
diff --git a/Source/platform/graphics/paint/ClipPathDisplayItem.h b/Source/platform/graphics/paint/ClipPathDisplayItem.h
index 23238873bad2711d33a550c99e3b3c282511c4d5..7b605b1f457bf30b00eddbb166723b0a7147cb4e 100644
--- a/Source/platform/graphics/paint/ClipPathDisplayItem.h
+++ b/Source/platform/graphics/paint/ClipPathDisplayItem.h
@@ -14,38 +14,24 @@
 namespace blink {
 
 class PLATFORM_EXPORT BeginClipPathDisplayItem : public PairedBeginDisplayItem {
-    WTF_MAKE_FAST_ALLOCATED(BeginClipPathDisplayItem);
 public:
-    static PassOwnPtr<BeginClipPathDisplayItem> create(const DisplayItemClientWrapper& client, const Path& clipPath)
+    void setNew(const Path& clipPath)
     {
-        return adoptPtr(new BeginClipPathDisplayItem(client, clipPath));
+        m_clipPath = clipPath.skPath();
     }
 
-    BeginClipPathDisplayItem(const DisplayItemClientWrapper& client, const Path& clipPath)
-        : PairedBeginDisplayItem(client, BeginClipPath)
-        , m_clipPath(clipPath.skPath()) { }
-
     virtual void replay(GraphicsContext&) override;
     virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override;
 
 private:
-    const SkPath m_clipPath;
+    SkPath m_clipPath;
 #ifndef NDEBUG
     virtual void dumpPropertiesAsDebugString(WTF::StringBuilder&) const override;
 #endif
 };
 
 class PLATFORM_EXPORT EndClipPathDisplayItem : public PairedEndDisplayItem {
-    WTF_MAKE_FAST_ALLOCATED(EndClipPathDisplayItem);
 public:
-    static PassOwnPtr<EndClipPathDisplayItem> create(const DisplayItemClientWrapper& client)
-    {
-        return adoptPtr(new EndClipPathDisplayItem(client));
-    }
-
-    EndClipPathDisplayItem(const DisplayItemClientWrapper& client)
-        : PairedEndDisplayItem(client, EndClipPath) { }
-
     virtual void replay(GraphicsContext&) override;
     virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override;