Adding DRP specfic UMA for FirstContentfulPaint

content/test/test_navigation_url_loader.h

 // Copyright (c) 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_TEST_TEST_NAVIGATION_URL_LOADER_H_
 #define CONTENT_TEST_TEST_NAVIGATION_URL_LOADER_H_
 
 #include <memory>
 
 #include "base/memory/weak_ptr.h"
 #include "content/browser/frame_host/navigation_request_info.h"
 #include "content/browser/loader/navigation_url_loader.h"
 #include "content/common/navigation_params.h"
 
 namespace net {
 struct RedirectInfo;
 }
 
 namespace content {
-
+class NavigationData;
 class NavigationURLLoaderDelegate;
 class StreamHandle;
 struct ResourceResponse;
 
 // PlzNavigate
 // Test implementation of NavigationURLLoader to simulate the network stack
 // response.
 class TestNavigationURLLoader
     : public NavigationURLLoader,
       public base::SupportsWeakPtr<TestNavigationURLLoader> {
  public:
   TestNavigationURLLoader(std::unique_ptr<NavigationRequestInfo> request_info,
                           NavigationURLLoaderDelegate* delegate);
 
   // NavigationURLLoader implementation.
   void FollowRedirect() override;
   void ProceedWithResponse() override;
 
   NavigationRequestInfo* request_info() const { return request_info_.get(); }
 
   void SimulateServerRedirect(const GURL& redirect_url);
 
   void SimulateError(int error_code);
 
   void CallOnRequestRedirected(const net::RedirectInfo& redirect_info,
                                const scoped_refptr<ResourceResponse>& response);
   void CallOnResponseStarted(const scoped_refptr<ResourceResponse>& response,
-                             std::unique_ptr<StreamHandle> body);
+                             std::unique_ptr<StreamHandle> body,
+                             std::unique_ptr<NavigationData> navigation_data);
 
   int redirect_count() { return redirect_count_; }
 
   bool response_proceeded() { return response_proceeded_; }
 
  private:
   ~TestNavigationURLLoader() override;
 
   std::unique_ptr<NavigationRequestInfo> request_info_;
   NavigationURLLoaderDelegate* delegate_;
   int redirect_count_;
   bool response_proceeded_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_TEST_NAVIGATION_URL_LOADER_H_