Add <link rel=preconnect> crossorigin attribute (take 2)

Source/platform/network/NetworkHints.cpp

Index: Source/platform/network/NetworkHints.cpp
diff --git a/Source/platform/network/NetworkHints.cpp b/Source/platform/network/NetworkHints.cpp
index e48f51b48529fbbb7c93bedb8dc92e2a16716fc2..db8118038a6115675945da4fbd3332bb5332963f 100644
--- a/Source/platform/network/NetworkHints.cpp
+++ b/Source/platform/network/NetworkHints.cpp
@@ -38,10 +38,15 @@ void prefetchDNS(const String& hostname)
         prescientNetworking->prefetchDNS(hostname);
 }
 
-void preconnect(const KURL& url)
+void preconnect(const KURL& url, const CrossOriginAttributeValue crossOrigin)
 {
-    if (WebPrescientNetworking* prescientNetworking = Platform::current()->prescientNetworking())
-        prescientNetworking->preconnect(url);
+    if (WebPrescientNetworking* prescientNetworking = Platform::current()->prescientNetworking()) {
+        // TODO(yoav): Call only the crossorigin interface once everything is hooked up.
+        if (crossOrigin == CrossOriginAttributeNotSet)
+            prescientNetworking->preconnect(url);
+        else
+            prescientNetworking->preconnect(url, crossOrigin);
+    }
 }
 
 } // namespace blink