PlzNavigate: Add first version of NavigationURLLoader.

content/browser/loader/navigation_url_loader.cc

Index: content/browser/loader/navigation_url_loader.cc
diff --git a/content/browser/loader/navigation_url_loader.cc b/content/browser/loader/navigation_url_loader.cc
new file mode 100644
index 0000000000000000000000000000000000000000..879ea48ac4f53f7bc0547e0e21fb906f273a499e
--- /dev/null
+++ b/content/browser/loader/navigation_url_loader.cc
@@ -0,0 +1,37 @@
+// Copyright 2014 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 "content/browser/loader/navigation_url_loader.h"
+
+#include "content/browser/frame_host/navigation_request_info.h"
+#include "content/browser/loader/navigation_url_loader_factory.h"
+#include "content/browser/loader/navigation_url_loader_impl.h"
+
+namespace content {
+
+static NavigationURLLoaderFactory* g_factory = nullptr;
+
+scoped_ptr<NavigationURLLoader> NavigationURLLoader::Create(
+    BrowserContext* browser_context,
+    int64 frame_tree_node_id,
+    const CommonNavigationParams& common_params,
+    scoped_ptr<NavigationRequestInfo> request_info,
+    ResourceRequestBody* request_body,
+    Delegate* delegate) {
+  if (g_factory) {
+    return g_factory->CreateLoader(browser_context, frame_tree_node_id,
+                                   common_params, request_info.Pass(),
+                                   request_body, delegate);
+  }
+  return scoped_ptr<NavigationURLLoader>(new NavigationURLLoaderImpl(
+      browser_context, frame_tree_node_id, common_params, request_info.Pass(),
+      request_body, delegate));
+}
+
+void NavigationURLLoader::SetFactoryForTesting(
+    NavigationURLLoaderFactory* factory) {
+  g_factory = factory;
+}
+
+}  // namespace content