PlzNavigate: Add first version of NavigationURLLoader.

content/browser/loader/navigation_url_loader_core.h

+// 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.
+
+#ifndef CONTENT_BROWSER_LOADER_NAVIGATION_URL_LOADER_CORE_H_
+#define CONTENT_BROWSER_LOADER_NAVIGATION_URL_LOADER_CORE_H_
+
+#include "base/basictypes.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "content/browser/loader/navigation_url_loader_impl.h"
+
+namespace net {
+class URLRequest;
+struct RedirectInfo;
+}
+
+namespace content {
+
+class FrameTreeNode;
+class NavigationResourceHandler;
+class ResourceContext;
+class ResourceHandler;
+class ResourceRequestBody;
+class StreamHandle;
+struct ResourceResponse;
+
+// The IO-thread counterpart to the NavigationURLLoaderImpl. It lives on the IO
+// thread and is owned by the UI-thread
+// NavigationURLLoaderImpl. NavigationURLLoaderCore interacts with the
+// ResourceDispatcherHost stack and forwards signals back to the loader on the
+// UI thread.
+class NavigationURLLoaderCore {

[mmenke, 2014/10/22 15:32:58]

Think "NavigationURLLoaderImplCore" is clearer.

[davidben, 2014/10/22 20:58:04]

Done. (So long...)

+ public:
+  // Creates a new NavigationURLLoaderCore that forwards signals back to
+  // |loader| on the UI thread.
+  NavigationURLLoaderCore(const base::WeakPtr<NavigationURLLoaderImpl>& loader);

[mmenke, 2014/10/22 15:32:58]

explicit

[davidben, 2014/10/22 20:58:04]

Done.

+  ~NavigationURLLoaderCore();
+
+  // Starts the request.
+  void Start(ResourceContext* resource_context,
+             int64 frame_tree_node_id,
+             const CommonNavigationParams& common_params,
+             scoped_ptr<NavigationRequestInfo> request_info,
+             ResourceRequestBody* request_body);
+
+  // After a redirect to follow the redirect.

[mmenke, 2014/10/22 15:32:58]

nit:  Grammar seems a bit weird here.  Maybe just "Follow the currently pending
redirect."?

[davidben, 2014/10/22 20:58:04]

Done.

+  void FollowRedirect();
+
+  void set_resource_handler(NavigationResourceHandler* resource_handler) {
+    resource_handler_ = resource_handler;
+  }
+
+  // Notifies |loader_| on the UI thread that the request was redirected.
+  void NotifyRequestRedirected(const net::RedirectInfo& redirect_info,
+                               ResourceResponse* response);
+
+  // Notifies |loader_| on the UI thread that the response started.
+  void NotifyResponseStarted(ResourceResponse* response,
+                             scoped_ptr<StreamHandle> body);
+
+  // Notifies |loader_| on the UI thread that the request failed.
+  void NotifyRequestFailed(int net_error);
+
+ private:
+  base::WeakPtr<NavigationURLLoaderImpl> loader_;
+  NavigationResourceHandler* resource_handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(NavigationURLLoaderCore);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_LOADER_NAVIGATION_URL_LOADER_H_