Plumb NQP to context and to http_proxy_client_socket_pool

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 da9363077b19e2d240e6eec16901ce832efa24fd..2d3eb9ca2c0c907be2d70686b22de4c9f4f594f7 100644
--- a/net/url_request/url_request_context_builder.cc
+++ b/net/url_request/url_request_context_builder.cc
@@ -231,6 +231,8 @@ void URLRequestContextBuilder::SetHttpNetworkSessionComponents(
       request_context->http_server_properties();
   session_context->net_log = request_context->net_log();
   session_context->channel_id_service = request_context->channel_id_service();
+  session_context->network_quality_estimator =
+      request_context->network_quality_estimator();
 }
 
 void URLRequestContextBuilder::EnableHttpCache(const HttpCacheParams& params) {
@@ -420,6 +422,7 @@ std::unique_ptr<URLRequestContext> URLRequestContextBuilder::Build() {
   if (socket_performance_watcher_factory_) {
     network_session_context.socket_performance_watcher_factory =
         socket_performance_watcher_factory_;
+    DCHECK(network_session_context.network_quality_estimator);
   }
 
   storage->set_http_network_session(base::MakeUnique<HttpNetworkSession>(