Added <link rel=preconnect> crossorigin attribute

public/platform/WebCrossOriginAttribute.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef WebCrossOriginAttribute_h
+#define WebCrossOriginAttribute_h
+
+namespace blink {
+
+enum CrossOriginAttributeValue {
+    CrossOriginAttributeNotSet,
+    CrossOriginAttributeAnonymous,
+    CrossOriginAttributeUseCredentials,

[Mike West, 2015/05/11 12:53:35]

You'll also need "no-cors".

+};
+
+} // namespace blink
+
+#endif
+