Extract the SVG Filter Reference implementation out of the FilterEffectRenderer into its own type

Source/core/platform/graphics/filters/ReferenceFilter.cpp

Index: Source/core/platform/graphics/filters/ReferenceFilter.cpp
diff --git a/Source/core/rendering/style/StyleCustomFilterProgram.cpp b/Source/core/platform/graphics/filters/ReferenceFilter.cpp
similarity index 70%
copy from Source/core/rendering/style/StyleCustomFilterProgram.cpp
copy to Source/core/platform/graphics/filters/ReferenceFilter.cpp
index 31c3d64d662ce7da9ff0582f323a1c6c79d0fe36..2b84dd5a963bc4aeebf8e05539e1872d74b2f950 100644
--- a/Source/core/rendering/style/StyleCustomFilterProgram.cpp
+++ b/Source/core/platform/graphics/filters/ReferenceFilter.cpp
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2013 Adobe Systems Incorporated. All rights reserved.
+ * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -29,18 +30,28 @@
 
 #include "config.h"
 
-#include "core/rendering/style/StyleCustomFilterProgram.h"
+#include "core/platform/graphics/filters/ReferenceFilter.h"
 
-#include "core/rendering/style/StyleCustomFilterProgramCache.h"
+#include "core/platform/graphics/filters/FilterEffect.h"
+#include "core/platform/graphics/filters/SourceGraphic.h"
 
 namespace WebCore {
 
-StyleCustomFilterProgram::~StyleCustomFilterProgram()
+ReferenceFilter::ReferenceFilter()
+    : Filter(AffineTransform())
+    , m_sourceGraphic(SourceGraphic::create(this))
 {
-    if (m_cache)
-        m_cache->remove(this);
+    // FIXME: This should come from the filter DOM node's filterRes attribute.
+    setFilterResolution(FloatSize(1, 1));
 }
 
-} // namespace WebCore
+void ReferenceFilter::setLastEffect(PassRefPtr<FilterEffect> effect)
+{
+    m_lastEffect = effect;
+}
 
+ReferenceFilter::~ReferenceFilter()
+{
+}
 
+} // namespace WebCore