Adding DRP specfic UMA for FirstContentfulPaint

content/browser/loader/navigation_url_loader_impl.h

Index: content/browser/loader/navigation_url_loader_impl.h
diff --git a/content/browser/loader/navigation_url_loader_impl.h b/content/browser/loader/navigation_url_loader_impl.h
index 51131cc12d0b482c4e567c4bb2c426e6c4f9d504..d3d2d38e713a9898735d6c3c5c561e23450198a9 100644
--- a/content/browser/loader/navigation_url_loader_impl.h
+++ b/content/browser/loader/navigation_url_loader_impl.h
@@ -13,20 +13,21 @@
 #include "base/time/time.h"
 #include "content/browser/loader/navigation_url_loader.h"
 
 namespace net {
 struct RedirectInfo;
 }
 
 namespace content {
 
 class NavigationURLLoaderImplCore;
+class NavigationData;
 class ServiceWorkerNavigationHandle;
 class StreamHandle;
 struct ResourceResponse;
 
 class NavigationURLLoaderImpl : public NavigationURLLoader {
  public:
   // The caller is responsible for ensuring that |delegate| outlives the loader.
   NavigationURLLoaderImpl(BrowserContext* browser_context,
                           std::unique_ptr<NavigationRequestInfo> request_info,
                           ServiceWorkerNavigationHandle* service_worker_handle,
@@ -39,21 +40,22 @@ class NavigationURLLoaderImpl : public NavigationURLLoader {
 
  private:
   friend class NavigationURLLoaderImplCore;
 
   // Notifies the delegate of a redirect.
   void NotifyRequestRedirected(const net::RedirectInfo& redirect_info,
                                const scoped_refptr<ResourceResponse>& response);
 
   // Notifies the delegate that the response has started.
   void NotifyResponseStarted(const scoped_refptr<ResourceResponse>& response,
-                             std::unique_ptr<StreamHandle> body);
+                             std::unique_ptr<StreamHandle> body,
+                             std::unique_ptr<NavigationData> navigation_data);
 
   // Notifies the delegate the request failed to return a response.
   void NotifyRequestFailed(bool in_cache, int net_error);
 
   // Notifies the delegate the begin navigation request was handled and a
   // potential first network request is about to be made.
   void NotifyRequestStarted(base::TimeTicks timestamp);
 
   NavigationURLLoaderDelegate* delegate_;