[Sync] Turn notifier::PushClient into an interface

jingle/notifier/listener/fake_push_client.h

Index: jingle/notifier/listener/fake_push_client.h
diff --git a/jingle/notifier/listener/fake_push_client.h b/jingle/notifier/listener/fake_push_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..61ba72b2d94e9e5a594871e700661fa87cf17a77
--- /dev/null
+++ b/jingle/notifier/listener/fake_push_client.h
@@ -0,0 +1,55 @@
+// 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 JINGLE_NOTIFIER_LISTENER_FAKE_PUSH_CLIENT_H_
+#define JINGLE_NOTIFIER_LISTENER_FAKE_PUSH_CLIENT_H_
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/observer_list.h"
+#include "jingle/notifier/listener/push_client.h"
+
+namespace notifier {
+
+// PushClient implementation that can be used for testing.
+class FakePushClient : public PushClient {
+ public:
+  FakePushClient();
+  virtual ~FakePushClient();
+
+  // PushClient implementation.
+  virtual void AddObserver(PushClientObserver* observer) OVERRIDE;
+  virtual void RemoveObserver(PushClientObserver* observer) OVERRIDE;
+  virtual void UpdateSubscriptions(
+      const SubscriptionList& subscriptions) OVERRIDE;
+  virtual void UpdateCredentials(
+      const std::string& email, const std::string& token) OVERRIDE;
+  virtual void SendNotification(const Notification& notification) OVERRIDE;
+
+  // Triggers OnNotificationStateChange on all observers.
+  void SimulateNotificationStateChange(bool notifications_enabled);
+
+  // Triggers OnIncomingNotification on all observers.
+  void SimulateIncomingNotification(const Notification& notification);
+
+  const SubscriptionList& subscriptions() const;
+  const std::string& email() const;
+  const std::string& token() const;
+  const std::vector<Notification>& sent_notifications() const;
+
+ private:
+  ObserverList<PushClientObserver> observers_;
+  SubscriptionList subscriptions_;
+  std::string email_;
+  std::string token_;
+  std::vector<Notification> sent_notifications_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakePushClient);
+};
+
+}  // namespace notifier
+
+#endif  // JINGLE_NOTIFIER_LISTENER_FAKE_PUSH_CLIENT_H_