Enable NQE when Cronet Engine is built

net/url_request/url_request_context_builder.cc

Index: net/url_request/url_request_context_builder.cc
diff --git a/net/url_request/url_request_context_builder.cc b/net/url_request/url_request_context_builder.cc
index edbca15f96b577560041462c57db7494f57d517c..325fc7442d5b33416a375a08d6a981f674459e6d 100644
--- a/net/url_request/url_request_context_builder.cc
+++ b/net/url_request/url_request_context_builder.cc
@@ -211,7 +211,8 @@ URLRequestContextBuilder::URLRequestContextBuilder()
       backoff_enabled_(false),
       sdch_enabled_(false),
       cookie_store_set_by_client_(false),
-      net_log_(nullptr) {
+      net_log_(nullptr),
+      socket_performance_watcher_factory_(nullptr) {
 }
 
 URLRequestContextBuilder::~URLRequestContextBuilder() {}
@@ -445,6 +446,10 @@ std::unique_ptr<URLRequestContext> URLRequestContextBuilder::Build() {
     network_session_params.proxy_delegate = proxy_delegate_.get();
     storage->set_proxy_delegate(std::move(proxy_delegate_));
   }
+  if (socket_performance_watcher_factory_) {
+    network_session_params.socket_performance_watcher_factory =
+        socket_performance_watcher_factory_;
+  }
 
   storage->set_http_network_session(
       base::WrapUnique(new HttpNetworkSession(network_session_params)));