Adding DRP specfic UMA for FirstContentfulPaint

content/browser/frame_host/navigation_handle_impl.cc

Index: content/browser/frame_host/navigation_handle_impl.cc
diff --git a/content/browser/frame_host/navigation_handle_impl.cc b/content/browser/frame_host/navigation_handle_impl.cc
index d096bdfd0bd69cfec66356ced4dc248c1be4d37a..be062f34a68182c4ee17afdc4dafdfb854efd9b2 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -249,20 +249,24 @@ NavigationHandleImpl::CallWillRedirectRequestForTesting(
   WillRedirectRequest(new_url, new_method_is_post ? "POST" : "GET",
                       new_referrer_url, new_is_external_protocol,
                       scoped_refptr<net::HttpResponseHeaders>(),
                       base::Bind(&UpdateThrottleCheckResult, &result));
 
   // Reset the callback to ensure it will not be called later.
   complete_callback_.Reset();
   return result;
 }
 
+NavigationData* NavigationHandleImpl::GetNavigationData() {
+  return navigation_data_.get();
+}
+
 void NavigationHandleImpl::InitServiceWorkerHandle(
     ServiceWorkerContextWrapper* service_worker_context) {
   DCHECK(IsBrowserSideNavigationEnabled());
   service_worker_handle_.reset(
       new ServiceWorkerNavigationHandle(service_worker_context));
 }
 
 void NavigationHandleImpl::WillStartRequest(
     const std::string& method,
     const Referrer& sanitized_referrer,