Add support for additional blend modes to SVGFEBlendElement

Source/core/svg/SVGEnumeration.cpp

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 48 matching lines @@
 
 String SVGEnumerationBase::valueAsString() const
 {
     StringEntries::const_iterator it = m_entries.begin();
     StringEntries::const_iterator itEnd = m_entries.end();
     for (; it != itEnd; ++it) {
         if (m_value == it->first)
             return it->second;
     }
 
-    ASSERT(m_value < maxEnumValue());
+    ASSERT(m_value < maxInternalEnumValue());
     return emptyString();
 }
 
 void SVGEnumerationBase::setValue(unsigned short value, ExceptionState& exceptionState)
 {
     if (!value) {
         exceptionState.throwTypeError("The enumeration value provided is 0, which is not settable.");
         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;
     }
 
     m_value = value;
     notifyChange();
 }
 
 void SVGEnumerationBase::setValueAsString(const String& string, ExceptionState& exceptionState)
 {
     StringEntries::const_iterator it = m_entries.begin();
@@ skipping 26 matching lines @@
     animationElement->animateDiscreteType<unsigned short>(percentage, fromEnumeration, toEnumeration, m_value);
 }
 
 float SVGEnumerationBase::calculateDistance(PassRefPtr<SVGPropertyBase>, SVGElement*)
 {
     // No paced animations for boolean.
     return -1;
 }
 
 }