Treat non-callable input as null for EventHandler attributes

LayoutTests/fast/dom/Window/get-set-properties.html

 <p>This page tests getting and setting window properties and functions.</p>
 <pre id="console"></pre>
 
 <script>
 function log(s)
 {
     document.getElementById("console").appendChild(document.createTextNode(s + "\n"));
 }
 
 function shouldBe(a, b)
@@ skipping 25 matching lines @@
 function canGet(keyPath)
 {
     try {
         return eval("window." + keyPath) !== undefined;
     } catch(e) {
         return false;
     }
 }
 
 window.marker = { "foo": "bar", toString: function(){ return "window.marker.toString()"; } };
+window.callableMarker = function() { return "window.callableMarker.toString()"; };
 
 function canSet(keyPath)
 {
     var valuePath = "window.marker";
 
     try {
         eval("window." + keyPath + " = " + valuePath);
         return eval("window." + keyPath) === eval("window." + valuePath);
     } catch(e) {
         return false;
     }
 }
 
 function canSetWithTypeConversion(keyPath)
 {
     var valuePath = "window.marker";
 
     try {
         eval("window." + keyPath + " = " + valuePath);
         return eval("window." + keyPath) == eval("window." + valuePath);
     } catch(e) {
         return false;
     }
 }
 
+function canSetWithCallable(keyPath)
+{
+    var valuePath = "window.callableMarker";
+
+    try {
+        eval("window." + keyPath + " = " + valuePath);
+        return eval("window." + keyPath) === eval("window." + valuePath);
+    } catch(e) {
+        return false;
+    }
+}
+
 var windowReadWriteProperties = [
     "Attr", 
     "CDATASection", 
     "CSSPrimitiveValue", 
     "CSSRule", 
     "CSSStyleDeclaration", 
     "CSSValue", 
     "CharacterData", 
     "Comment", 
     "DOMException", 
@@ skipping 137 matching lines @@
     "blur",
     "close",
     "confirm",
     "find", 
     "focus",
     "getComputedStyle",
     "getMatchedCSSRules", 
     "getSelection",
     "moveBy", 
     "moveTo", 
+    "open", 
+    "print", 
+    "prompt", 
+    "releaseEvents",
+    "removeEventListener", 
+    "resizeBy", 
+    "resizeTo", 
+    "scroll", 
+    "scrollBy", 
+    "scrollTo", 
+    "setInterval", 
+    "setTimeout", 
+    "stop"
+];
+
+var windowEventHandlers = [
     "onabort", 
     "onbeforeunload", 
     "onblur", 
     "onchange", 
     "onclick", 
     "ondblclick", 
     "onerror", 
     "onfocus", 
     "onkeydown", 
     "onkeypress", 
     "onkeyup", 
     "onload", 
     "onmousedown", 
     "onmousemove", 
     "onmouseout", 
     "onmouseover", 
     "onmouseup", 
     "onmousewheel", 
     "onreset", 
     "onresize", 
     "onscroll", 
     "onsearch", 
     "onselect", 
     "onsubmit", 
-    "onunload", 
-    "open", 
-    "print", 
-    "prompt", 
-    "releaseEvents",
-    "removeEventListener", 
-    "resizeBy", 
-    "resizeTo", 
-    "scroll", 
-    "scrollBy", 
-    "scrollTo", 
-    "setInterval", 
-    "setTimeout", 
-    "stop"
+    "onunload"
 ];
 
 window.onload = function()
 {
     if (window.testRunner)
         testRunner.dumpAsText();
 
     log("\n----- tests for getting/setting read-write properties -----\n");
 
-    for (var i = 0; i < windowReadWriteProperties.length; i++) { //>
+    for (var i = 0; i < windowReadWriteProperties.length; i++) {
         var property = windowReadWriteProperties[i];
         shouldBeTrue("canGet('" + property + "')");
         shouldBeTrue("canSet('" + property + "')");
     }
 
     log("\n----- tests for getting/setting readonly properties -----\n");
 
-    for (var i = 0; i < windowReadOnlyProperties.length; i++) { //>
+    for (var i = 0; i < windowReadOnlyProperties.length; i++) {
         var property = windowReadOnlyProperties[i];
         shouldBeTrue("canGet('" + property + "')");
         shouldBeFalse("canSet('" + property + "')");
     }
 
     log("\n----- tests for getting/setting string properties -----\n");
-    for (var i = 0; i < windowReadWriteStringProperties.length; i++) { //>
+    for (var i = 0; i < windowReadWriteStringProperties.length; i++) {
         var property = windowReadWriteStringProperties[i];
         shouldBeTrue("canGet('" + property + "')");
         shouldBeTrue("canSetWithTypeConversion('" + property + "')");
         
     }
 
     log("\n----- tests for getting/setting functions -----\n");
 
-    for (var i = 0; i < windowFunctions.length; i++) { //>
+    for (var i = 0; i < windowFunctions.length; i++) {
         var property = windowFunctions[i];
         shouldBeTrue("canGet('" + property + "')");
         shouldBeTrue("canSet('" + property + "')");
     }
+
+    log("\n----- tests for getting/setting event handlers -----\n");
+
+    for (var i = 0; i < windowEventHandlers.length; i++) {
+        var property = windowEventHandlers[i];
+        shouldBeTrue("canGet('" + property + "')");
+        shouldBeTrue("canSetWithCallable('" + property + "')");
+    }
 }
 </script>