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 3fb54d3d630c78122168737168a34aee8d8411e6..a205cea258bffa682d9caf6630fcdab31e6e6c39 100644
--- a/content/public/browser/resource_dispatcher_host_delegate.cc
+++ b/content/public/browser/resource_dispatcher_host_delegate.cc
@@ -90,17 +90,23 @@ void ResourceDispatcherHostDelegate::OnRequestRedirected(
 void ResourceDispatcherHostDelegate::RequestComplete(
     net::URLRequest* url_request) {
 }
 
 bool ResourceDispatcherHostDelegate::ShouldEnableLoFiMode(
     const net::URLRequest& url_request,
     content::ResourceContext* resource_context) {
   return false;
 }
 
+bool ResourceDispatcherHostDelegate::UsedDataReductionProxy(
+    const net::HostPortPair& proxy_server,
+    ResourceContext* resource_context) {
+  return false;
+}
+
 ResourceDispatcherHostDelegate::ResourceDispatcherHostDelegate() {
 }
 
 ResourceDispatcherHostDelegate::~ResourceDispatcherHostDelegate() {
 }
 
 }  // namespace content