PlzNavigate: Add first version of NavigationURLLoader.

content/browser/frame_host/navigation_request.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_FRAME_HOST_NAVIGATION_REQUEST_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
+#include "content/browser/loader/navigation_url_loader_delegate.h"
 #include "content/common/content_export.h"
 #include "content/common/navigation_params.h"
 
 namespace content {
 
 class FrameTreeNode;
+class NavigationURLLoader;
 class ResourceRequestBody;
 struct NavigationRequestInfo;
 
 // PlzNavigate
 // A UI thread object that owns a navigation request until it commits. It
 // ensures the UI thread can start a navigation request in the
 // ResourceDispatcherHost (that lives on the IO thread).
 // TODO(clamy): Describe the interactions between the UI and IO thread during
 // the navigation following its refactoring.
-class CONTENT_EXPORT NavigationRequest {
+class CONTENT_EXPORT NavigationRequest : public NavigationURLLoaderDelegate {
  public:
   NavigationRequest(FrameTreeNode* frame_tree_node,
                     const CommonNavigationParams& common_params,
                     const CommitNavigationParams& commit_params);
 
-  ~NavigationRequest();
+  ~NavigationRequest() override;
 
   // Called on the UI thread by the RenderFrameHostManager which owns the
   // NavigationRequest. Takes ownership of |info|. After calling this function,
   // |body| can no longer be manipulated on the UI thread.
   void BeginNavigation(scoped_ptr<NavigationRequestInfo> info,
                        scoped_refptr<ResourceRequestBody> body);
 
   CommonNavigationParams& common_params() { return common_params_; }
 
   const CommitNavigationParams& commit_params() const { return commit_params_; }
 
-  NavigationRequestInfo* info_for_test() const { return info_.get(); }
+  NavigationURLLoader* loader_for_testing() const { return loader_.get(); }
 
  private:
+  // NavigationURLLoaderDelegate implementation.
+  void OnRequestRedirected(
+      const net::RedirectInfo& redirect_info,
+      const scoped_refptr<ResourceResponse>& response) override;
+  void OnResponseStarted(const scoped_refptr<ResourceResponse>& response,
+                         scoped_ptr<StreamHandle> body) override;
+  void OnRequestFailed(int net_error) override;
+
   FrameTreeNode* frame_tree_node_;
 
   // Initialized on creation of the NavigationRequest. Sent to the renderer when
   // the navigation is ready to commit.
   // Note: When the navigation is ready to commit, the url in |common_params|
   // will be set to the final navigation url, obtained after following all
   // redirects.
   CommonNavigationParams common_params_;
   const CommitNavigationParams commit_params_;
 
-  // Initialized when beginning the navigation.
-  scoped_ptr<NavigationRequestInfo> info_;
+  scoped_ptr<NavigationURLLoader> loader_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationRequest);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_H_