[Chromecast] Add proxy server support to chromecast

chromecast/net/connectivity_checker.h

 // Copyright 2015 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 CHROMECAST_NET_CONNECTIVITY_CHECKER_H_
 #define CHROMECAST_NET_CONNECTIVITY_CHECKER_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list_threadsafe.h"
 
+class PrefProxyConfigTracker;
+
 namespace base {
 class SingleThreadTaskRunner;
 }
 
+namespace net {
+class ProxyConfigService;
+}
+
 namespace chromecast {
 
 // Checks if internet connectivity is available.
 class ConnectivityChecker
     : public base::RefCountedThreadSafe<ConnectivityChecker> {
  public:
   class ConnectivityObserver {
    public:
     // Will be called when internet connectivity changes.
     virtual void OnConnectivityChanged(bool connected) = 0;
 
    protected:
     ConnectivityObserver() {}
     virtual ~ConnectivityObserver() {}
 
    private:
     DISALLOW_COPY_AND_ASSIGN(ConnectivityObserver);
   };
 
   static scoped_refptr<ConnectivityChecker> Create(
-      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
+      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
+      std::unique_ptr<PrefProxyConfigTracker> pref_proxy_config_tracker);
 
   ConnectivityChecker();
 
   void AddConnectivityObserver(ConnectivityObserver* observer);
   void RemoveConnectivityObserver(ConnectivityObserver* observer);
 
+  virtual void DetachFromPrefService() = 0;
+
   // Returns if there is internet connectivity.
   virtual bool Connected() const = 0;
 
   // Checks for connectivity.
   virtual void Check() = 0;
 
  protected:
   virtual ~ConnectivityChecker();
 
   // Notifies observes that connectivity has changed.
   void Notify(bool connected);
 
  private:
   friend class base::RefCountedThreadSafe<ConnectivityChecker>;
 
   const scoped_refptr<base::ObserverListThreadSafe<ConnectivityObserver>>
       connectivity_observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(ConnectivityChecker);
 };
 
 }  // namespace chromecast
 
 #endif  // CHROMECAST_NET_CONNECTIVITY_CHECKER_H_