Reorder the AnimatedPropertyType enumeration

third_party/WebKit/Source/core/svg/SVGElement.cpp

Index: third_party/WebKit/Source/core/svg/SVGElement.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGElement.cpp b/third_party/WebKit/Source/core/svg/SVGElement.cpp
index 26e0d38ddc0333ac465aafe22444790a08bb8121..f0748a37561b247338dae7c88cff870c369e0c19 100644
--- a/third_party/WebKit/Source/core/svg/SVGElement.cpp
+++ b/third_party/WebKit/Source/core/svg/SVGElement.cpp
@@ -703,11 +703,9 @@ AnimatedPropertyType SVGElement::animatedPropertyTypeForCSSAttribute(const Quali
         for (size_t i = 0; i < WTF_ARRAY_LENGTH(attrToTypes); i++)
             cssPropertyMap.set(attrToTypes[i].attr, attrToTypes[i].propType);
     }
-
-    if (cssPropertyMap.contains(attributeName))
-        return cssPropertyMap.get(attributeName);
-
-    return AnimatedUnknown;
+    // If the attribute is not present in the map, this will return the "empty
+    // value" per HashTraits - which is AnimatedUnknown.
+    return cssPropertyMap.get(attributeName);

[pdr., 2016/08/29 00:07:09]

In addition to this comment, can you enforce it with a DCHECK to prevent against
bad refactorings of the enum or hashtraits?

Possibly the following here or up in the cssPropertyMap initialization block
above:
DCHECK(HashTraits<AnimatedPropertyType>::emptyValue() == AnimatedUnknown);

 }
 
 void SVGElement::addToPropertyMap(SVGAnimatedPropertyBase* property)