Add support for additional blend modes to SVGFEBlendElement

Source/core/svg/SVGEnumeration.cpp

Index: Source/core/svg/SVGEnumeration.cpp
diff --git a/Source/core/svg/SVGEnumeration.cpp b/Source/core/svg/SVGEnumeration.cpp
index 2838406004c5eb33eed9daec3ca61bda19050b96..88f7d93a86c97b47a89dc0db9d482f4708b3db8d 100644
--- a/Source/core/svg/SVGEnumeration.cpp
+++ b/Source/core/svg/SVGEnumeration.cpp
@@ -66,7 +66,7 @@ String SVGEnumerationBase::valueAsString() const
             return it->second;
     }
 
-    ASSERT(m_value < maxEnumValue());
+    ASSERT(m_value < maxInternalEnumValue());
     return emptyString();
 }
 
@@ -77,8 +77,8 @@ void SVGEnumerationBase::setValue(unsigned short value, ExceptionState& exceptio
         return;
     }
 
-    if (value > maxEnumValue()) {
-        exceptionState.throwTypeError("The enumeration value provided (" + String::number(value) + ") is larger than the largest allowed value (" + String::number(maxEnumValue()) + ").");
+    if (value > maxExposedEnumValue()) {
+        exceptionState.throwTypeError("The enumeration value provided (" + String::number(value) + ") is larger than the largest allowed value (" + String::number(maxExposedEnumValue()) + ").");
         return;
     }