Add WebPrescientNetworking to trigger preconnect from Blink.

Source/core/platform/network/Preconnect.cpp

Index: Source/core/platform/network/Preconnect.cpp
diff --git a/Source/core/page/RuntimeEnabledFeaturesCustom.cpp b/Source/core/platform/network/Preconnect.cpp
similarity index 78%
copy from Source/core/page/RuntimeEnabledFeaturesCustom.cpp
copy to Source/core/platform/network/Preconnect.cpp
index 2df390c281f06a8f6ea2157ba8be109616028eb0..7de8c3fc831b8c7c04d766866f310c7ab7b4ecd2 100644
--- a/Source/core/page/RuntimeEnabledFeaturesCustom.cpp
+++ b/Source/core/platform/network/Preconnect.cpp
@@ -29,21 +29,20 @@
  */
 
 #include "config.h"
-#include "RuntimeEnabledFeatures.h"
+#include "core/platform/network/Preconnect.h"
 
-#include "core/platform/graphics/MediaPlayer.h"
-#include "core/workers/SharedWorkerRepository.h"
+#include <public/Platform.h>
+#include <public/WebURL.h>
+#include <public/WebPrerenderingSupport.h>
 
 namespace WebCore {
 
-bool RuntimeEnabledFeatures::mediaEnabled()
+void preconnect(const KURL& url, PreconnectMotivation motivation)
 {
-    return MediaPlayer::isAvailable();
+    WebKit::WebPrerenderingSupport* platform = WebKit::WebPrerenderingSupport::current();
+    if (!platform)
+        return;
+    platform->preconnect(WebKit::WebURL(url), static_cast<WebKit::WebPreconnectMotivation>(motivation));
 }
 
-bool RuntimeEnabledFeatures::sharedWorkerEnabled()
-{
-    return SharedWorkerRepository::isAvailable();
 }
-
-} // namespace WebCore