Expose changes in the network quality to the renderers

chrome/browser/io_thread.h

 // 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.
 
 #ifndef CHROME_BROWSER_IO_THREAD_H_
 #define CHROME_BROWSER_IO_THREAD_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 14 matching lines @@
 #include "chrome/browser/net/chrome_network_delegate.h"
 #include "chrome/common/features.h"
 #include "components/metrics/data_use_tracker.h"
 #include "components/prefs/pref_member.h"
 #include "components/ssl_config/ssl_config_service_manager.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/browser_thread_delegate.h"
 #include "extensions/features/features.h"
 #include "net/base/network_change_notifier.h"
 #include "net/http/http_network_session.h"
+#include "net/nqe/network_quality_estimator.h"
 
 class PrefProxyConfigTracker;
 class PrefService;
 class PrefRegistrySimple;
 class SystemURLRequestContextGetter;
 
 #if defined(OS_ANDROID)
 namespace chrome {
 namespace android {
 class ExternalDataUseObserver;
@@ skipping 139 matching lines @@
     // |system_cookie_store| and |system_channel_id_service| are shared
     // between |proxy_script_fetcher_context| and |system_request_context|.
     std::unique_ptr<net::CookieStore> system_cookie_store;
 #if BUILDFLAG(ENABLE_EXTENSIONS)
     scoped_refptr<extensions::EventRouterForwarder>
         extension_event_router_forwarder;
 #endif
     std::unique_ptr<net::HostMappingRules> host_mapping_rules;
     std::unique_ptr<net::HttpUserAgentSettings> http_user_agent_settings;
     std::unique_ptr<net::NetworkQualityEstimator> network_quality_estimator;
+    std::unique_ptr<
+        net::NetworkQualityEstimator::RTTAndThroughputEstimatesObserver>
+        network_quality_observer;
 
     // NetErrorTabHelper uses |dns_probe_service| to send DNS probes when a
     // main frame load fails with a DNS error in order to provide more useful
     // information to the renderer so it can show a more specific error page.
     std::unique_ptr<chrome_browser_net::DnsProbeService> dns_probe_service;
 
     // Enables Brotli Content-Encoding support
     bool enable_brotli;
   };
 
@@ skipping 200 matching lines @@
   bool http_09_on_non_default_ports_enabled_;
 
   const base::TimeTicks creation_time_;
 
   base::WeakPtrFactory<IOThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IOThread);
 };
 
 #endif  // CHROME_BROWSER_IO_THREAD_H_