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 d2ce77506681fefb5d26932bf6cffa1c4eef1fdd..2f48b59fbcd58c8daf2543f4a96a787645b7f5df 100644
--- a/content/test/test_navigation_url_loader_delegate.h
+++ b/content/test/test_navigation_url_loader_delegate.h
@@ -47,22 +47,24 @@ 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,
-                         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_;