Adding DRP specfic UMA for FirstContentfulPaint

content/test/test_navigation_url_loader_delegate.cc

Index: content/test/test_navigation_url_loader_delegate.cc
diff --git a/content/test/test_navigation_url_loader_delegate.cc b/content/test/test_navigation_url_loader_delegate.cc
index 3a98776c412a4b207a61f38594a57bc4b73c1c2f..adfcb6da95c4012353ed356721b7375fa5e21c22 100644
--- a/content/test/test_navigation_url_loader_delegate.cc
+++ b/content/test/test_navigation_url_loader_delegate.cc
@@ -1,17 +1,18 @@
 // 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.
 
 #include "content/test/test_navigation_url_loader_delegate.h"
 
 #include "base/run_loop.h"
+#include "content/public/browser/navigation_data.h"
 #include "content/public/browser/stream_handle.h"
 #include "content/public/common/resource_response.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
 
 TestNavigationURLLoaderDelegate::TestNavigationURLLoaderDelegate()
     : net_error_(0), on_request_handled_counter_(0) {}
 
 TestNavigationURLLoaderDelegate::~TestNavigationURLLoaderDelegate() {}
@@ -48,21 +49,22 @@ void TestNavigationURLLoaderDelegate::OnRequestRedirected(
     const net::RedirectInfo& redirect_info,
     const scoped_refptr<ResourceResponse>& response) {
   redirect_info_ = redirect_info;
   redirect_response_ = response;
   ASSERT_TRUE(request_redirected_);
   request_redirected_->Quit();
 }
 
 void TestNavigationURLLoaderDelegate::OnResponseStarted(
     const scoped_refptr<ResourceResponse>& response,
-    std::unique_ptr<StreamHandle> body) {
+    std::unique_ptr<StreamHandle> body,
+    std::unique_ptr<NavigationData> navigation_data) {
   response_ = response;
   body_ = std::move(body);
   ASSERT_TRUE(response_started_);
   response_started_->Quit();
 }
 
 void TestNavigationURLLoaderDelegate::OnRequestFailed(bool in_cache,
                                                       int net_error) {
   net_error_ = net_error;
   if (request_failed_)