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 a6e71b29b780dd72438eb93d60c48a5a96a6fc49..1a6e124a3737b953112cb8522dfe0ef33cd2f97b 100644
--- a/net/url_request/url_request_context_builder.cc
+++ b/net/url_request/url_request_context_builder.cc
@@ -213,7 +213,8 @@ 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() {}
@@ -452,6 +453,10 @@ 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)));