Refactor ResourceRequestAllowedNotifier EULA checking into a separate class.

chrome/browser/metrics/variations/eula_accepted_notifier.h

+// Copyright (c) 2013 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_METRICS_VARIATIONS_EULA_ACCEPTED_NOTIFIER_H_
+#define CHROME_BROWSER_METRICS_VARIATIONS_EULA_ACCEPTED_NOTIFIER_H_
+
+#include "base/basictypes.h"
+
+// Interface for querying the EULA accepted state and receiving a notification
+// when the EULA is accepted. This abstracts away the platform-specific logic
+// for EULA notifications on different platforms.
+class EulaAcceptedNotifier {
+ public:
+  // Observes EULA accepted state changes.
+  class Observer {
+   public:
+    virtual void OnEulaAccepted() = 0;
+  };
+
+  EulaAcceptedNotifier();
+  virtual ~EulaAcceptedNotifier();
+
+  // Initializes this class with the given |observer|. Must be called before
+  // the class is used.
+  void Init(Observer* observer);
+
+  // Returns true if the EULA has been accepted. If the EULA has not yet been
+  // accepted, begins monitoring the EULA state and will notify the observer
+  // once the EULA has been accepted.
+  virtual bool IsEulaAccepted() = 0;
+
+  // Factory method for this class.
+  static EulaAcceptedNotifier* Create();
+
+ protected:
+  // Notifies the observer that the EULA has been updated, to be called by
+  // platform-specific subclasses.
+  void NotifyObserver();
+
+ private:
+  // Observer of the EULA accepted notification.
+  Observer* observer_;
+
+  DISALLOW_COPY_AND_ASSIGN(EulaAcceptedNotifier);
+};
+
+#endif  // CHROME_BROWSER_METRICS_VARIATIONS_EULA_ACCEPTED_NOTIFIER_H_