Make Network Predictor skip empty urls

net/http/http_stream_factory_impl.cc

 // 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 "net/http/http_stream_factory_impl.h"
 
 #include <string>
 #include <tuple>
 
 #include "base/logging.h"
@@ skipping 176 matching lines @@
   Request* request = job_controller_raw_ptr->Start(
       request_info, delegate, websocket_handshake_stream_create_helper, net_log,
       stream_type, priority, server_ssl_config, proxy_ssl_config);
 
   return request;
 }
 
 void HttpStreamFactoryImpl::PreconnectStreams(
     int num_streams,
     const HttpRequestInfo& request_info) {
+  DCHECK(request_info.url.is_valid());
+
   AddJobControllerCountToHistograms();
 
   SSLConfig server_ssl_config;
   SSLConfig proxy_ssl_config;
   session_->GetSSLConfig(request_info, &server_ssl_config, &proxy_ssl_config);
   // All preconnects should perform EV certificate verification.
   server_ssl_config.verify_ev_cert = true;
   proxy_ssl_config.verify_ev_cert = true;
 
   DCHECK(!for_websockets_);
@@ skipping 243 matching lines @@
   factory_dump->AddScalar("main_job_count",
                           base::trace_event::MemoryAllocatorDump::kUnitsObjects,
                           main_job_count);
   // The number of preconnect controllers.
   factory_dump->AddScalar("preconnect_count",
                           base::trace_event::MemoryAllocatorDump::kUnitsObjects,
                           num_controllers_for_preconnect);
 }
 
 }  // namespace net