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diff --git a/chrome/browser/net/pref_proxy_config_tracker_impl.h b/chrome/browser/net/pref_proxy_config_tracker_impl.h
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+++ b/chrome/browser/net/pref_proxy_config_tracker_impl.h
@@ -0,0 +1,155 @@
+// Copyright (c) 2011 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_NET_PREF_PROXY_CONFIG_TRACKER_IMPL_H_
+#define CHROME_BROWSER_NET_PREF_PROXY_CONFIG_TRACKER_IMPL_H_
+#pragma once
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/observer_list.h"
+#include "chrome/browser/prefs/proxy_config_dictionary.h"
+#include "content/public/browser/notification_observer.h"
+#include "net/proxy/proxy_config.h"
+#include "net/proxy/proxy_config_service.h"
+
+class PrefService;
+class PrefSetObserver;
+
+// A net::ProxyConfigService implementation that applies preference proxy
+// settings (pushed from PrefProxyConfigTrackerImpl) as overrides to the proxy
+// configuration determined by a baseline delegate ProxyConfigService on
+// non-ChromeOS platforms. ChromeOS has its own implementation of overrides in
+// chromeos::ProxyConfigServiceImpl.
+class ChromeProxyConfigService
+    : public net::ProxyConfigService,
+      public net::ProxyConfigService::Observer {
+ public:
+  // Takes ownership of the passed |base_service|.
+  explicit ChromeProxyConfigService(net::ProxyConfigService* base_service);
+  virtual ~ChromeProxyConfigService();
+
+  // ProxyConfigService implementation:
+  virtual void AddObserver(net::ProxyConfigService::Observer* observer);
+  virtual void RemoveObserver(net::ProxyConfigService::Observer* observer);
+  virtual ConfigAvailability GetLatestProxyConfig(net::ProxyConfig* config);
+  virtual void OnLazyPoll();
+
+  // Method on IO thread that receives the preference proxy settings pushed from
+  // PrefProxyConfigTrackerImpl.
+  void UpdateProxyConfig(ProxyPrefs::ConfigState config_state,
+                         const net::ProxyConfig& config);
+
+ private:
+  // ProxyConfigService::Observer implementation:
+  virtual void OnProxyConfigChanged(const net::ProxyConfig& config,
+                                    ConfigAvailability availability);
+
+  // Makes sure that the observer registration with the base service is set up.
+  void RegisterObserver();
+
+  scoped_ptr<net::ProxyConfigService> base_service_;
+  ObserverList<net::ProxyConfigService::Observer, true> observers_;
+
+  // Tracks configuration state of |pref_config_|. |pref_config_| is valid only
+  // if |pref_config_state_| is not CONFIG_UNSET.
+  ProxyPrefs::ConfigState pref_config_state_;
+
+  // Configuration as defined by prefs.
+  net::ProxyConfig pref_config_;
+
+  // Indicates whether the base service registration is done.
+  bool registered_observer_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeProxyConfigService);
+};
+
+// A class that tracks proxy preferences. It translates the configuration
+// to net::ProxyConfig and pushes the result over to the IO thread for
+// ChromeProxyConfigService::UpdateProxyConfig to use.
+class PrefProxyConfigTrackerImpl : public content::NotificationObserver {
+ public:
+  explicit PrefProxyConfigTrackerImpl(PrefService* pref_service);
+  virtual ~PrefProxyConfigTrackerImpl();
+
+  // Sets the proxy config service to push the preference proxy to.
+  void SetChromeProxyConfigService(
+      ChromeProxyConfigService* proxy_config_service);
+
+  // Notifies the tracker that the pref service passed upon construction is
+  // about to go away. This must be called from the UI thread.
+  void DetachFromPrefService();
+
+  // Determines if |config_state| takes precedence regardless, which happens if
+  // config is from policy or extension or other-precede.
+  static bool PrefPrecedes(ProxyPrefs::ConfigState config_state);
+
+  // Determines the proxy configuration that should take effect in the network
+  // layer, based on prefs and system configurations.
+  // |pref_state| refers to state of |pref_config|.
+  // |system_availability| refers to availability of |system_config|.
+  // |ignore_fallback_config| indicates if fallback config from prefs should
+  // be ignored.
+  // Returns effective |effective_config| and its state in
+  // |effective_config_source|.
+  static net::ProxyConfigService::ConfigAvailability GetEffectiveProxyConfig(
+      ProxyPrefs::ConfigState pref_state,
+      const net::ProxyConfig& pref_config,
+      net::ProxyConfigService::ConfigAvailability system_availability,
+      const net::ProxyConfig& system_config,
+      bool ignore_fallback_config,
+      ProxyPrefs::ConfigState* effective_config_state,
+      net::ProxyConfig* effective_config);
+
+  // Registers the proxy preference.
+  static void RegisterPrefs(PrefService* user_prefs);
+
+ protected:
+  // Get the proxy configuration currently defined by preferences.
+  // Status is indicated in the return value.
+  // Writes the configuration to |config| unless the return value is
+  // CONFIG_UNSET, in which case |config| and |config_source| are not touched.
+  ProxyPrefs::ConfigState GetProxyConfig(net::ProxyConfig* config);
+
+  // Called when there's a change in prefs proxy config.
+  // Subclasses can extend it for changes in other sources of proxy config.
+  virtual void OnProxyConfigChanged(ProxyPrefs::ConfigState config_state,
+                                    const net::ProxyConfig& config);
+
+  // content::NotificationObserver implementation:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details);
+
+  // Converts a ProxyConfigDictionary to net::ProxyConfig representation.
+  // Returns true if the data from in the dictionary is valid, false otherwise.
+  bool PrefConfigToNetConfig(const ProxyConfigDictionary& proxy_dict,
+                             net::ProxyConfig* config);
+
+  const PrefService* prefs() const { return pref_service_; }
+  bool update_pending() const { return update_pending_; }
+
+ private:
+  // Creates a proxy configuration from proxy-related preferences. Configuration
+  // is stored in |config|, return value indicates whether the configuration is
+  // valid.
+  ProxyPrefs::ConfigState ReadPrefConfig(net::ProxyConfig* config);
+
+  // Tracks configuration state. |pref_config_| is valid only if |config_state_|
+  // is not CONFIG_UNSET.
+  ProxyPrefs::ConfigState config_state_;
+
+  // Configuration as defined by prefs.
+  net::ProxyConfig pref_config_;
+
+  PrefService* pref_service_;
+  ChromeProxyConfigService* chrome_proxy_config_service_;  // Weak ptr.
+  bool update_pending_;  // True if config has not been pushed to network stack.
+  scoped_ptr<PrefSetObserver> proxy_prefs_observer_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrefProxyConfigTrackerImpl);
+};
+
+#endif  // CHROME_BROWSER_NET_PREF_PROXY_CONFIG_TRACKER_IMPL_H_