Adding DRP specfic UMA for FirstContentfulPaint

content/test/test_navigation_url_loader_delegate.cc

 // 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/stream_handle.h"
 #include "content/public/common/resource_response.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 37 matching lines @@
     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,
-    scoped_ptr<StreamHandle> body) {
+    scoped_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_)
     request_failed_->Quit();
 }
 
 void TestNavigationURLLoaderDelegate::OnRequestStarted(
     base::TimeTicks timestamp) {
   ASSERT_FALSE(timestamp.is_null());
   ++on_request_handled_counter_;
   if (request_started_)
     request_started_->Quit();
 }
 
 }  // namespace content