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 237b4145550e6e220b1bc6ef8089f15ba6024162..464f185fb0ed01012514ca973933e8187050ab11 100644
--- a/content/test/test_navigation_url_loader_delegate.cc
+++ b/content/test/test_navigation_url_loader_delegate.cc
@@ -48,21 +48,22 @@ 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,
-    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_)