[SVG] Handle non-SVGAnimateElement results in calculateAnimatedValue()

Source/core/svg/animation/SMILTimeContainer.cpp

Index: Source/core/svg/animation/SMILTimeContainer.cpp
diff --git a/Source/core/svg/animation/SMILTimeContainer.cpp b/Source/core/svg/animation/SMILTimeContainer.cpp
index 6c9a9b8b40f4a01eb699ee59466db87aa21f6085..7f9db027ed28578b52a3487a5a5a0717faa4e1a7 100755
--- a/Source/core/svg/animation/SMILTimeContainer.cpp
+++ b/Source/core/svg/animation/SMILTimeContainer.cpp
@@ -286,6 +286,7 @@ void SMILTimeContainer::updateAnimations(SMILTime elapsed, bool seekToTime)
             ASSERT(animation->hasValidAttributeName());
 
             // Results are accumulated to the first animation that animates and contributes to a particular element/attribute pair.
+            // FIXME: we should ensure that resultElement is of an appropriate type.
             if (!resultElement) {
                 if (!animation->hasValidAttributeType())
                     continue;