[Sync] Turn notifier::PushClient into an interface

jingle/notifier/listener/fake_push_client_observer.h

Index: jingle/notifier/listener/fake_push_client_observer.h
diff --git a/jingle/notifier/listener/fake_push_client_observer.h b/jingle/notifier/listener/fake_push_client_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..b8ee6d6efedf0f56167b87a41a30a193f3f41878
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+++ b/jingle/notifier/listener/fake_push_client_observer.h
@@ -0,0 +1,35 @@
+// 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_NON_BLOCKING_FAKE_PUSH_CLIENT_OBSERVER_H_
+#define JINGLE_NOTIFIER_LISTENER_NON_BLOCKING_FAKE_PUSH_CLIENT_OBSERVER_H_
+
+#include "base/compiler_specific.h"
+#include "jingle/notifier/listener/push_client_observer.h"
+
+namespace notifier {
+
+// PushClientObserver implementation that can be used for testing.
+class FakePushClientObserver : public PushClientObserver {
+ public:
+  FakePushClientObserver();
+  virtual ~FakePushClientObserver();
+
+  // PushClientObserver implementation.
+  virtual void OnNotificationStateChange(
+      bool notifications_enabled) OVERRIDE;
+  virtual void OnIncomingNotification(
+      const Notification& notification) OVERRIDE;
+
+  bool notifications_enabled() const;
+  const Notification& last_incoming_notification() const;
+
+ private:
+  bool notifications_enabled_;
+  Notification last_incoming_notification_;
+};
+
+}  // namespace notifier
+
+#endif  // JINGLE_NOTIFIER_LISTENER_NON_BLOCKING_FAKE_PUSH_CLIENT_OBSERVER_H_