Activate the VariationsService for ChromeOS and ensure that it does not ping the server until the E…

chrome/browser/resource_request_allowed_notifier.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_RESOURCE_REQUEST_ALLOWED_NOTIFIER_H_
+#define CHROME_BROWSER_RESOURCE_REQUEST_ALLOWED_NOTIFIER_H_
+
+#include "base/observer_list.h"
+#include "net/base/network_change_notifier.h"
+
+#if defined(OS_CHROMEOS)
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#endif
+
+// Services that need to request resources over the network should use this
+// helper class to check if they can perform their requests. They should check
+// both IsNetworkAccessAllowed and IsEulaAccepted before requesting their data.
+// If either is false, the service can add themselves as an observer of this
+// class and be notified when the network is up, or the EULA is accepted.
+class ResourceRequestAllowedNotifier :
+#if defined(OS_CHROMEOS)
+    public content::NotificationObserver,
+#endif
+    public net::NetworkChangeNotifier::ConnectionTypeObserver {
+ public:
+  // Observes network and EULA state changes.
+  class Observer {
+   public:
+    // Called after the network changes to an active connection.
+    virtual void OnNetworkChangedToActiveConnection() = 0;
+
+#if defined(OS_CHROMEOS)
+    // Called after the EULA has been accepted.
+    virtual void OnEulaAccepted() = 0;
+#endif
+  };
+
+  ResourceRequestAllowedNotifier();
+  virtual ~ResourceRequestAllowedNotifier();
+
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
+  // Returns true iff the network is currently inaccessible.
+  static bool IsNetworkOffline();
+
+#if defined(OS_CHROMEOS)
+  // Returns true iff the EULA was accepted by the user.
+  static bool IsEulaAccepted();
+
+  // content::NotificationObserver overrides:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+#endif
+
+  // net::NetworkChangeNotifier::ConnectionTypeObserver implementation.
+  virtual void OnConnectionTypeChanged(
+      net::NetworkChangeNotifier::ConnectionType type) OVERRIDE;
+
+ private:
+  // List of observers interested in request permissions.
+  ObserverList<Observer> observer_list_;
+
+  DISALLOW_COPY_AND_ASSIGN(ResourceRequestAllowedNotifier);
+};
+
+#endif  // CHROME_BROWSER_RESOURCE_REQUEST_ALLOWED_NOTIFIER_H_