[Slimming Paint] Implement deferred SVG filters

Source/platform/graphics/paint/DisplayItem.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DisplayItem_h
 #define DisplayItem_h
 
 #include "platform/PlatformExport.h"
 #include "wtf/Assertions.h"
 #include "wtf/PassOwnPtr.h"
@@ skipping 72 matching lines @@
         FloatClipSelection,
         FloatClipSelfOutline,
         EndFloatClip,
         BeginClipPath,
         EndClipPath,
         VideoBitmap,
         ImageBitmap,
         DragImage,
         LinkHighlight,
         PageWidgetDelegateClip,
-        PageWidgetDelegateBackgroundFallback
+        PageWidgetDelegateBackgroundFallback,
+        SVGFilter
     };
 
     // Create a dummy display item which just holds the id but has no display operation.
     // It helps a CachedDisplayItem to match the corresponding original empty display item.
     static PassOwnPtr<DisplayItem> create(DisplayItemClient client, Type type) { return adoptPtr(new DisplayItem(client, type)); }
 
     virtual ~DisplayItem() { }
 
     virtual void replay(GraphicsContext*) { }
 
@@ skipping 36 matching lines @@
         const Type type;
     } m_id;
 #ifndef NDEBUG
     WTF::String m_clientDebugString;
 #endif
 };
 
 }
 
 #endif // DisplayItem_h