Adding DRP specfic UMA for FirstContentfulPaint

content/public/browser/resource_dispatcher_host_delegate.cc

Index: content/public/browser/resource_dispatcher_host_delegate.cc
diff --git a/content/public/browser/resource_dispatcher_host_delegate.cc b/content/public/browser/resource_dispatcher_host_delegate.cc
index b30b6b468fd12126069a456f7c407c90cf34d3ef..6b57b792a255638960c43bd6c7ca0a62628330f9 100644
--- a/content/public/browser/resource_dispatcher_host_delegate.cc
+++ b/content/public/browser/resource_dispatcher_host_delegate.cc
@@ -1,16 +1,17 @@
 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/public/browser/resource_dispatcher_host_delegate.h"
 
+#include "content/public/browser/navigation_data.h"
 #include "content/public/browser/resource_request_info.h"
 #include "content/public/browser/stream_info.h"
 
 namespace content {
 
 bool ResourceDispatcherHostDelegate::ShouldBeginRequest(
     const std::string& method,
     const GURL& url,
     ResourceType resource_type,
     ResourceContext* resource_context) {
@@ -89,17 +90,22 @@ void ResourceDispatcherHostDelegate::OnRequestRedirected(
 void ResourceDispatcherHostDelegate::RequestComplete(
     net::URLRequest* url_request) {
 }
 
 bool ResourceDispatcherHostDelegate::ShouldEnableLoFiMode(
     const net::URLRequest& url_request,
     content::ResourceContext* resource_context) {
   return false;
 }
 
+NavigationData* ResourceDispatcherHostDelegate::GetNavigationData(
+    net::URLRequest* request) const {
+  return nullptr;
+}
+
 ResourceDispatcherHostDelegate::ResourceDispatcherHostDelegate() {
 }
 
 ResourceDispatcherHostDelegate::~ResourceDispatcherHostDelegate() {
 }
 
 }  // namespace content