CSP: Check <param> element values against the document's CSP before loading.

LayoutTests/http/tests/security/contentSecurityPolicy/resources/object-src-param.js

+if (window.testRunner) {
+    testRunner.dumpAsText();
+    testRunner.waitUntilDone();
+}
+
+function appendObjectElement(type) {
+    window.onload = function () {
+        var o = document.createElement('object');
+        o.setAttribute('type', 'application/x-webkit-test-netscape');
+        o.addEventListener('load', function () {
+            console.log('FAIL: The object should have been blocked.');
+            if (window.testRunner)
+                testRunner.notifyDone();
+        });
+        o.addEventListener('error', function () {
+            console.log('PASS: Error occurred, so load was correctly blocked.');
+            if (window.testRunner)
+                testRunner.notifyDone();
+        });
+
+        var p = document.createElement('param');
+        p.setAttribute('value', 'http://127.0.0.1:8080/plugins/resources/mock-plugin.pl?' + type);
+        p.setAttribute('name', type);
+
+        o.appendChild(p);
+
+        document.body.appendChild(o);
+    };
+}