Adding DRP specfic UMA for FirstContentfulPaint

content/test/test_navigation_url_loader_delegate.h

 // Copyright 2016 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_DELEGATE_H_
 #define CONTENT_TEST_TEST_NAVIGATION_URL_LOADER_DELEGATE_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 36 matching lines @@
   void WaitForResponseStarted();
   void WaitForRequestFailed();
   void WaitForRequestStarted();
 
   void ReleaseBody();
 
   // NavigationURLLoaderDelegate implementation.
   void OnRequestRedirected(
       const net::RedirectInfo& redirect_info,
       const scoped_refptr<ResourceResponse>& response) override;
-  void OnResponseStarted(const scoped_refptr<ResourceResponse>& response,
-                         std::unique_ptr<StreamHandle> body) override;
+  void OnResponseStarted(
+      const scoped_refptr<ResourceResponse>& response,
+      std::unique_ptr<StreamHandle> body,
+      std::unique_ptr<NavigationData> navigation_data) override;
   void OnRequestFailed(bool in_cache, int net_error) override;
   void OnRequestStarted(base::TimeTicks timestamp) override;
 
  private:
   net::RedirectInfo redirect_info_;
   scoped_refptr<ResourceResponse> redirect_response_;
   scoped_refptr<ResourceResponse> response_;
   std::unique_ptr<StreamHandle> body_;
   int net_error_;
   int on_request_handled_counter_;
 
   std::unique_ptr<base::RunLoop> request_redirected_;
   std::unique_ptr<base::RunLoop> response_started_;
   std::unique_ptr<base::RunLoop> request_failed_;
   std::unique_ptr<base::RunLoop> request_started_;
 
   DISALLOW_COPY_AND_ASSIGN(TestNavigationURLLoaderDelegate);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_TEST_NAVIGATION_URL_LOADER_DELEGATE_H