Adding DRP specfic UMA for FirstContentfulPaint

content/test/test_navigation_url_loader_delegate.h

Index: content/test/test_navigation_url_loader_delegate.h
diff --git a/content/test/test_navigation_url_loader_delegate.h b/content/test/test_navigation_url_loader_delegate.h
index e5c3c21882f3218d5f2c25cc9dd74bef32a593e8..a0cdd2ebcc0aa9831b174f3a73b96b9bead622ef 100644
--- a/content/test/test_navigation_url_loader_delegate.h
+++ b/content/test/test_navigation_url_loader_delegate.h
@@ -1,17 +1,19 @@
 // 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"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
 #include "content/browser/loader/navigation_url_loader_delegate.h"
 #include "net/url_request/redirect_info.h"
 
 namespace base {
 class RunLoop;
 }
@@ -46,22 +48,24 @@ class TestNavigationURLLoaderDelegate : public NavigationURLLoaderDelegate {
   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,
-                         scoped_ptr<StreamHandle> body) override;
+  void OnResponseStarted(
+      const scoped_refptr<ResourceResponse>& response,
+      scoped_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_;
   scoped_ptr<StreamHandle> body_;
   int net_error_;
   int on_request_handled_counter_;