Adding DRP specfic UMA for FirstContentfulPaint

content/public/browser/navigation_handle.h

Index: content/public/browser/navigation_handle.h
diff --git a/content/public/browser/navigation_handle.h b/content/public/browser/navigation_handle.h
index f8a3b5e02fda3d45e37658e55253a77c4d3740bf..12e200b817f0ab3d8519b7ad9e32c461e26d9d19 100644
--- a/content/public/browser/navigation_handle.h
+++ b/content/public/browser/navigation_handle.h
@@ -159,15 +159,21 @@ class CONTENT_EXPORT NavigationHandle {
                                  bool has_user_gesture,
                                  ui::PageTransition transition,
                                  bool is_external_protocol) = 0;
 
   // Simulates the network request being redirected.
   virtual NavigationThrottle::ThrottleCheckResult
   CallWillRedirectRequestForTesting(const GURL& new_url,
                                     bool new_method_is_post,
                                     const GURL& new_referrer_url,
                                     bool new_is_external_protocol) = 0;
+
+  // True if the navigation used lofi.
+  virtual bool IsUsingLofi() const = 0;
+
+  // True if the navigation was proxied through the data reduction proxy.
+  virtual bool UsedDataReductionProxy() const = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_NAVIGATION_HANDLE_H_