Fixes the rendering of a SVG filter (e.g. feFlood) by testing against total

Source/platform/graphics/filters/FilterEffect.h

Index: Source/platform/graphics/filters/FilterEffect.h
diff --git a/Source/platform/graphics/filters/FilterEffect.h b/Source/platform/graphics/filters/FilterEffect.h
index 8e4c351797b89e23242f9b4739f65183519eb87e..52bc247e79f155a185cd6184605e1547678ba8b5 100644
--- a/Source/platform/graphics/filters/FilterEffect.h
+++ b/Source/platform/graphics/filters/FilterEffect.h
@@ -37,8 +37,6 @@
 #include "wtf/Uint8ClampedArray.h"
 #include "wtf/Vector.h"
 
-static const float kMaxFilterSize = 5000.0f;
-
 namespace WebCore {
 
 class Filter;
@@ -69,6 +67,10 @@ class PLATFORM_EXPORT FilterEffect : public RefCounted<FilterEffect> {
 public:
     virtual ~FilterEffect();
 
+    static bool isFilterSizeValid(const IntRect&);
+    static bool isFilterSizeValid(const FloatRect&);
+    static float maxFilterArea();
+
     void clearResult();
     void clearResultsRecursive();
 
@@ -179,7 +181,6 @@ public:
 
 protected:
     FilterEffect(Filter*);
-
     ImageBuffer* createImageBufferResult();
     Uint8ClampedArray* createUnmultipliedImageResult();
     Uint8ClampedArray* createPremultipliedImageResult();