PlzNavigate: Add first version of NavigationURLLoader.

content/browser/loader/navigation_resource_handler.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_RESOURCE_HANDLER_H_
+#define CONTENT_BROWSER_LOADER_NAVIGATION_RESOURCE_HANDLER_H_
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "content/browser/loader/resource_handler.h"
+#include "content/browser/loader/stream_writer.h"
+
+namespace content {
+
+class NavigationURLLoaderCore;
+
+// The leaf ResourceHandler used with NavigationURLLoaderCore.

[clamy, 2014/10/13 15:22:42]

nit: maybe prefix it with PlzNavigate?

[davidben, 2014/10/15 22:53:28]

Done.

+class NavigationResourceHandler : public ResourceHandler {
+ public:
+  NavigationResourceHandler(net::URLRequest* request,
+                            NavigationURLLoaderCore* core);
+  virtual ~NavigationResourceHandler();
+
+  // Called by the loader the cancel the request.
+  void Cancel();
+
+  // Called to the loader to resume a paused redirect.
+  void FollowRedirect();
+
+  // ResourceHandler implementation.
+  virtual void SetController(ResourceController* controller) override;
+
+  virtual bool OnUploadProgress(uint64 position, uint64 size) override;
+
+  virtual bool OnRequestRedirected(const net::RedirectInfo& redirect_info,
+                                   ResourceResponse* response,
+                                   bool* defer) override;
+
+  virtual bool OnResponseStarted(ResourceResponse* response,
+                                 bool* defer) override;
+
+  virtual bool OnWillStart(const GURL& url, bool* defer) override;
+
+  virtual bool OnBeforeNetworkStart(const GURL& url, bool* defer) override;
+
+  virtual bool OnWillRead(scoped_refptr<net::IOBuffer>* buf,
+                          int* buf_size,
+                          int min_size) override;
+
+  virtual bool OnReadCompleted(int bytes_read, bool* defer) override;
+
+  virtual void OnResponseCompleted(const net::URLRequestStatus& status,
+                                   const std::string& security_info,
+                                   bool* defer) override;
+
+  virtual void OnDataDownloaded(int bytes_downloaded) override;
+
+ private:
+  scoped_refptr<NavigationURLLoaderCore> core_;
+  StreamWriter writer_;
+
+  DISALLOW_COPY_AND_ASSIGN(NavigationResourceHandler);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_LOADER_CERTIFICATE_RESOURCE_HANDLER_H_