Implemented Document.contentType

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 395 matching lines @@
 function shouldBeZero(a, quiet) { shouldBe(a, "0", quiet); }
 
 function shouldBeEqualToString(a, b)
 {
   if (typeof a !== "string" || typeof b !== "string")
     debug("WARN: shouldBeEqualToString() expects string arguments");
   var unevaledString = JSON.stringify(b);
   shouldBe(a, unevaledString);
 }
 
+function shouldBeEqualToNumber(a, b)
+{
+  if (typeof a !== "string" || typeof b !== "number")
+    debug("WARN: shouldBeEqualToNumber() expects a string and a number arguments");
+  var unevaledString = JSON.stringify(b);
+  shouldBe(a, unevaledString);
+}
+
 function shouldBeEmptyString(a) { shouldBeEqualToString(a, ""); }
 
 function shouldEvaluateTo(actual, expected) {
   // A general-purpose comparator.  'actual' should be a string to be
   // evaluated, as for shouldBe(). 'expected' may be any type and will be
   // used without being eval'ed.
   if (expected == null) {
     // Do this before the object test, since null is of type 'object'.
     shouldBeNull(actual);
   } else if (typeof expected == "undefined") {
@@ skipping 339 matching lines @@
     testPassed = function(msg) {
         workerPort.postMessage('PASS:' + msg);
     };
     finishJSTest = function() {
         workerPort.postMessage('DONE:');
     };
     debug = function(msg) {
         workerPort.postMessage(msg);
     };
 }