Add WebPrescientNetworking to trigger preconnect from Blink.

Source/core/platform/network/Preconnect.h

Index: Source/core/platform/network/Preconnect.h
diff --git a/Source/modules/quota/StorageQuotaCallback.h b/Source/core/platform/network/Preconnect.h
similarity index 81%
copy from Source/modules/quota/StorageQuotaCallback.h
copy to Source/core/platform/network/Preconnect.h
index d281f4965552fc182b255a23931913f3b5a3d6b4..e66cc18474ade8c0ca50c3d371edc12a6db1c624 100644
--- a/Source/modules/quota/StorageQuotaCallback.h
+++ b/Source/core/platform/network/Preconnect.h
@@ -28,19 +28,23 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef StorageQuotaCallback_h
-#define StorageQuotaCallback_h
+#ifndef Preconnect_h
+#define Preconnect_h
 
-#include "wtf/RefCounted.h"
+#include <wtf/Forward.h>
+#include "core/platform/KURL.h"
 
 namespace WebCore {
 
-class StorageQuotaCallback : public RefCounted<StorageQuotaCallback> {
-public:
-    virtual ~StorageQuotaCallback() { }
-    virtual bool handleEvent(unsigned long long grantedQuotaInBytes) = 0;
+enum PreconnectMotivation {
+    PreconnectMotivationLinkMouseDown,
+    PreconnectMotivationLinkMouseOver,
+    PreconnectMotivationLinkTapUnconfirmed,
+    PreconnectMotivationLinkTapDown,
 };
 
-} // namespace
+void preconnect(const KURL& url, PreconnectMotivation motivation);
 
-#endif // StorageQuotaCallback_h
+}
+
+#endif