Add toSVGLengthType() and toSVGLengthMode() fuctions, and use it.

Source/core/svg/SVGLength.h

Index: Source/core/svg/SVGLength.h
diff --git a/Source/core/svg/SVGLength.h b/Source/core/svg/SVGLength.h
index 1bc530ed197bb6f924eff26a2c0dc3066ce1fd75..b549f087edf271064f867d738b114aeedcbedb74 100644
--- a/Source/core/svg/SVGLength.h
+++ b/Source/core/svg/SVGLength.h
@@ -168,6 +168,17 @@ struct SVGPropertyTraits<SVGLength> {
     static String toString(const SVGLength& type) { return type.valueAsString(); }
 };
 
+inline SVGLengthMode toSVGLengthMode(unsigned short mode)

[tkent, 2013/09/12 22:40:34]

We must need this type conversion only in SVGLength.cpp. We should implement
this function in SVGLength.cpp.

+{
+    ASSERT_WITH_SECURITY_IMPLICATION(!mode || mode > LengthModeOther);

[tkent, 2013/09/12 22:40:34]

I don't think this has security implication. Also, the assertion looks wrong.

+    return static_cast<SVGLengthMode>(mode);
+}
+
+inline SVGLengthType toSVGLengthType(unsigned short type)

[tkent, 2013/09/12 22:40:34]

Same comments.

+{
+    ASSERT_WITH_SECURITY_IMPLICATION(!type || (type == LengthTypeUnknown || type > LengthTypePC));
+    return static_cast<SVGLengthType>(type);
+}
 
 } // namespace WebCore