[SVG] SVGLength{,List} migration to new SVG property impl.

LayoutTests/resources/js-test.js

 // svg/dynamic-updates tests set enablePixelTesting=true, as we want to dump text + pixel results
 if (self.testRunner) {
     if (self.enablePixelTesting)
         testRunner.dumpAsTextWithPixelResults();
     else
         testRunner.dumpAsText();
 }
 
 var description, debug, successfullyParsed;
 
@@ skipping 140 matching lines @@
     return true;
 }
 
 function isMinusZero(n)
 {
     // the only way to tell 0 from -0 in JS is the fact that 1/-0 is
     // -Infinity instead of Infinity
     return n === 0 && 1/n < 0;
 }
 
+function isNewSVGTearOffType(v)
+{
+    return ['[object SVGLength]', '[object SVGLengthList]'].indexOf(""+v) != -1;
+}
+
 function isResultCorrect(actual, expected)
 {
     if (expected === 0)
         return actual === expected && (1/actual) === (1/expected);
     if (actual === expected)
         return true;
+    // http://crbug.com/308818 : The new implementation of SVGListProperties do not necessary return the same wrapper object, so === operator would not work. We compare for their string representation instead.
+    if (isNewSVGTearOffType(expected) && typeof(expected) == typeof(actual) && actual.valueAsString == expected.valueAsString)
+        return true;
     if (typeof(expected) == "number" && isNaN(expected))
         return typeof(actual) == "number" && isNaN(actual);
     if (expected && (Object.prototype.toString.call(expected) == Object.prototype.toString.call([])))
         return areArraysEqual(actual, expected);
     return false;
 }
 
 function stringify(v)
 {
+    if (isNewSVGTearOffType(v))
+        return v.valueAsString;
     if (v === 0 && 1/v < 0)
         return "-0";
     else return "" + v;
 }
 
 function evalAndLog(_a, _quiet)
 {
   if (typeof _a != "string")
     debug("WARN: tryAndLog() expects a string argument");
 
@@ skipping 569 matching lines @@
     testPassed = function(msg) {
         workerPort.postMessage('PASS:' + msg);
     };
     finishJSTest = function() {
         workerPort.postMessage('DONE:');
     };
     debug = function(msg) {
         workerPort.postMessage(msg);
     };
 }