Implement WebPrescientNetworking to trigger preconnect from Blink

chrome/renderer/net/prescient_networking_dispatcher.cc

Index: chrome/renderer/net/prescient_networking_dispatcher.cc
diff --git a/chrome/renderer/net/prescient_networking_dispatcher.cc b/chrome/renderer/net/prescient_networking_dispatcher.cc
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+++ b/chrome/renderer/net/prescient_networking_dispatcher.cc
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+// Copyright (c) 2013 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.
+
+#include "chrome/renderer/net/prescient_networking_dispatcher.h"
+
+#include "chrome/common/render_messages.h"
+#include "content/public/renderer/render_thread.h"
+
+using WebKit::WebPrescientNetworking;
+
+PrescientNetworkingDispatcher::~PrescientNetworkingDispatcher() {
+}
+
+void PrescientNetworkingDispatcher::preconnect(
+    const WebKit::WebURL& url,
+    WebKit::WebPreconnectMotivation motivation) {
+  // FIXME(kouhei) actual pre-connecting is currently disabled.
+  // This should shortly be enabled via Finch field trials in upcoming patch.
+  // content::RenderThread::Get()->Send(new ChromeViewHostMsg_Preconnect(url));
+}
+